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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	ACIW
Entity Registrant Name	ACI WORLDWIDE, INC.
Entity Central Index Key	0000935036
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		116,425,416

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 74,281	$ 69,710
Receivables, net of allowances of $4,001 and $4,799, respectively	278,369	262,845
Recoverable income taxes	7,673	7,921
Prepaid expenses	29,961	23,219
Other current assets	29,010	58,126
Total current assets	419,294	421,821
Noncurrent assets
Accrued receivables, net	187,133
Property and equipment, net	80,775	80,228
Software, net	150,653	155,386
Goodwill	909,691	909,691
Intangible assets, net	188,688	191,281
Deferred income taxes, net	22,109	66,749
Other noncurrent assets	56,826	36,483
TOTAL ASSETS	2,015,169	1,861,639
Current liabilities
Accounts payable	33,479	34,718
Employee compensation	34,350	48,933
Current portion of long-term debt	20,379	17,786
Deferred revenue	111,639	107,543
Income taxes payable	6,178	9,898
Other current liabilities	64,312	102,904
Total current liabilities	270,337	321,782
Noncurrent liabilities
Deferred revenue	45,380	51,967
Long-term debt	658,861	667,943
Deferred income taxes, net	26,564	16,910
Other noncurrent liabilities	35,005	38,440
Total liabilities	1,036,147	1,097,042
Commitments and contingencies
Stockholders' equity
Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued at March 31, 2018 and December 31, 2017
Common stock; $0.005 par value; 280,000,000 shares authorized; 140,525,055 shares issued at March 31, 2018 and December 31, 2017	702	702
Additional paid-in capital	616,913	610,345
Retained earnings	775,420	550,866
Treasury stock, at cost, 24,130,770 and 23,428,324 shares at March 31, 2018 and December 31, 2017, respectively	(342,316)	(319,960)
Accumulated other comprehensive loss	(71,697)	(77,356)
Total stockholders' equity	979,022	764,597
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 2,015,169	$ 1,861,639

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Receivables, allowances	$ 4,001	$ 4,799
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.005	$ 0.005
Common stock, shares authorized	280,000,000	280,000,000
Common stock, shares issued	140,525,055	140,525,055
Treasury stock, shares	24,130,770	23,428,324

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Revenues

Software as a service and platform as a service

$ 104,280

$ 99,447

License

28,046

59,381

Maintenance

56,659

54,471

Services

20,325

18,163

Total revenues

209,310

231,462

Operating expenses

Cost of revenue

^[1]

107,336

108,543

Research and development

36,791

37,285

Selling and marketing

31,893

27,137

General and administrative

28,649

32,503

Depreciation and amortization

21,345

22,371

Total operating expenses

226,014

227,839

Operating income (loss)

(16,704)

3,623

Other income (expense)

Interest expense

(9,365)

(10,160)

Interest income

2,744

106

Other, net

(55)

649

Total other income (expense)

(6,676)

(9,405)

Loss before income taxes

(23,380)

(5,782)

Income tax benefit

(3,952)

(4,174)

Net loss

$ (19,428)

$ (1,608)

Loss per common share

Basic

$ (0.17)

$ (0.01)

Diluted

$ (0.17)

$ (0.01)

Weighted average common shares outstanding

Basic

115,642

116,610

Diluted

115,642

116,610

[1]	The cost of revenue excludes charges for depreciation but includes amortization of purchased and developed software for resale.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,428)	$ (1,608)
Other comprehensive income:
Foreign currency translation adjustments	5,659	6,051
Total other comprehensive income	5,659	6,051
Comprehensive income (loss)	$ (13,769)	$ 4,443

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (19,428)	$ (1,608)
Adjustments to reconcile net loss to net cash flows from operating activities:
Depreciation	5,926	6,274
Amortization	19,067	19,364
Amortization of deferred debt issuance costs	699	1,734
Deferred income taxes	(4,827)	(5,919)
Stock-based compensation expense	6,362	6,297
Other	(663)	538
Changes in operating assets and liabilities
Receivables	68,741	84,033
Accounts payable	(2,611)	(3,689)
Accrued employee compensation	(14,743)	(12,421)
Current income taxes	(3,569)	(3,339)
Deferred revenue	11,326	9,049
Other current and noncurrent assets and liabilities	(21,144)	(14,627)
Net cash flows from operating activities	45,136	85,686
Cash flows from investing activities:
Purchases of property and equipment	(5,937)	(6,566)
Purchases of software and distribution rights	(6,652)	(5,839)
Net cash flows from investing activities	(12,589)	(12,405)
Cash flows from financing activities:
Proceeds from issuance of common stock	753	693
Proceeds from exercises of stock options	9,118	7,035
Repurchase of restricted stock for tax withholdings	(914)	(3,155)
Repurchases of common stock	(31,113)
Proceeds from revolving credit facility	48,000	12,000
Repayment of revolving credit facility	(50,000)	(100,000)
Proceeds from term portion of credit agreement		415,000
Repayment of term portion of credit agreement	(5,187)	(370,477)
Payment of debt issuance costs		(5,340)
Payments on other debt and capital leases	(352)	(4,629)
Net cash flows from financing activities	(29,695)	(48,873)
Effect of exchange rate fluctuations on cash	1,719	(417)
Net increase in cash and cash equivalents	4,571	23,991
Cash and cash equivalents, beginning of period	69,710	75,753
Cash and cash equivalents, end of period	74,281	99,744
Supplemental cash flow information
Income taxes paid	8,263	6,919
Interest paid	$ 13,127	$ 13,421

Condensed Consolidated Financial Statements

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Condensed Consolidated Financial Statements

1. Condensed Consolidated Financial Statements

The unaudited condensed consolidated financial statements include the accounts of ACI Worldwide, Inc. and its wholly-owned subsidiaries (collectively, the “Company”). All intercompany balances and transactions have been eliminated. The condensed consolidated financial statements as of March 31, 2018, and for the three months ended March 31, 2018 and 2017, are unaudited and reflect all adjustments of a normal recurring nature, which are, in the opinion of management, necessary for a fair presentation, in all material respects, of the financial position and operating results for the interim periods. The condensed consolidated balance sheet as of December 31, 2017 is derived from the audited financial statements.

The condensed consolidated financial statements contained herein should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2017, filed on February 27, 2018. Results for the three months ended March 31, 2018 are not necessarily indicative of results that may be attained in the future.

The preparation of condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make judgments, estimates, and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Other Current Assets and Other Current Liabilities


(in thousands)	March 31, 2018		December 31, 2017
Settlement deposits	$	8,905	$	22,282
Settlement receivables		11,883		30,063
Other		8,222		5,781

Total other current assets	$	29,010	$	58,126


(in thousands)	March 31, 2018		December 31, 2017
Settlement payables	$	20,245	$	48,953
Accrued interest		2,554		7,291
Vendor financed licenses		3,068		1,862
Royalties payable		9,883		9,264
Other		28,562		35,534

Total other current liabilities	$	64,312	$	102,904

Individuals and businesses settle their obligations to the Company’s various clients, primarily utility and other public sector clients, using credit or debit cards or via ACH payments. The Company creates a receivable for the amount due from the credit or debit card company and an offsetting payable to the client. Upon confirmation that the funds have been received, the Company settles the obligation to the client. Due to timing, in some instances, the Company may receive the funds into bank accounts controlled by and in the Company’s name that are not disbursed to its clients by the end of the day resulting in a settlement deposit on the Company’s books.

Off Balance Sheet Accounts

The Company also enters into agreements with certain clients to process payment funds on their behalf. When an ACH or automated teller machine network payment transaction is processed, a transaction is initiated to withdraw funds from the designated source account and deposit them into a settlement account, which is a trust account maintained for the benefit of the Company’s clients. A simultaneous transaction is initiated to transfer funds from the settlement account to the intended destination account. These “back to back” transactions are designed to settle at the same time, usually overnight, such that the Company receives the funds from the source at the same time as it sends the funds to their destination. However, due to the transactions being with various financial institutions there may be timing differences that result in float balances. These funds are maintained in accounts for the benefit of the client which is separate from the Company’s corporate assets. As the Company does not take ownership of the funds, the settlement accounts are not included in the Company’s balance sheet. The Company is entitled to interest earned on the fund balances. The collection of interest on these settlement accounts is considered in the Company’s determination of its fee structure for clients and represents a portion of the payment for services performed by the Company. The amount of settlement funds as of March 31, 2018 and December 31, 2017 were $216.1 million and $238.9 million, respectively.

Fair Value

The fair value of the Company’s Credit Agreement approximates the carrying value due to the floating interest rate (Level 2 of the fair value hierarchy). The Company measures the fair value of its Senior Notes based on Level 2 inputs, which include quoted market prices and interest rate spreads of similar securities. The fair value of the Company’s Senior Notes was $303.3 million and $305.7 million at March 31, 2018 and December 31, 2017, respectively.

The fair values of cash and cash equivalents approximate the carrying values due to the short period of time to maturity (Level 2 of the fair value hierarchy).

Goodwill

In accordance with ASC 350, Intangibles – Goodwill and Other, the Company assesses goodwill for impairment annually during the fourth quarter of its fiscal year using October 1 balances or when there is evidence that events or changes in circumstances indicate that the carrying amount of the asset may not be recovered. The Company evaluates goodwill at the reporting unit level, and has identified its operating segments, ACI On Demand and ACI On Premise, as its reporting units. The Company allocated goodwill to the reporting units using a relative fair value approach with total goodwill of $909.7 million of which we allocated $725.9 million and $183.8 million to ACI On Premise and ACI On Demand, respectively.

Recoverability of goodwill is measured using a discounted cash flow model incorporating discount rates commensurate with the risks involved. Use of a discounted cash flow model is common practice in impairment testing in the absence of available transactional market evidence to determine the fair value. The calculated fair value was substantially in excess of the current carrying value for all reporting units based upon our October 1, 2017 annual impairment test and there have been no indications of impairment in the subsequent periods.

New Accounting Standards Recently Adopted

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (codified as “ASC 606”) as well as other clarifications and technical guidance related to this new revenue standard, including ASC 340-40, Other Assets and Deferred Costs – Contracts with Customers (“ASC 340-40). ASC 606 superseded the revenue recognition requirements in ASC 605, Revenue Recognition, and most industry-specific guidance. The Company adopted ASC 606 and ASC 340-40 on January 1, 2018 (the effective date) using the modified retrospective transition method which required an adjustment to retained earnings for the cumulative effect of applying ASC 606 to active contracts as of the adoption date. For active contracts that were modified before the effective date, the Company reflected the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price in accordance with the practical expedient permitted under ASC 606. The cumulative effect of applying ASC 606 to active contracts as of the adoption date was an increase to retained earnings of $244.0 million.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments, an update that addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Among the cash flow matters addressed in the update are payments for costs related to debt prepayments or extinguishments, payments related to settlement of certain types of debt instruments, payments of contingent consideration made after a business combination, proceeds from insurance claims and corporate-owned life insurance policies, and distributions received from equity method investees, among others. The amendments are applied using a retrospective transition method to each period presented, unless impracticable for specific cash flow matters, in which case the amendments would be applied prospectively as of the earliest date practicable. The Company adopted ASU 2016-15 as of January 1, 2018. The adoption of ASU 2016-15 was not material to the condensed consolidated statement of cash flows.

In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other than Inventory, to simplify the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Previously, U.S. GAAP prohibited the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. This prohibition on recognition was an exception to the principle of comprehensive recognition of current and deferred income taxes in U.S. GAAP. The limited amount of authoritative guidance about the exception led to diversity in practice and is a source of complexity in financial reporting, particularly for an intra-entity transfer of intellectual property. Under the amendments of ASU 2016-16, an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, this amendment eliminates the exception for an intra-entity transfer of an asset other than inventory. The amendments to this ASU should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company adopted ASU 2016-15 as of January 1, 2018. The adoption of ASU 2016-15 had no impact on the condensed consolidated balance sheet, results of operations, or statement of cash flows.

Recently Issued Accounting Standards Not Yet Effective

In February 2016, the FASB issued ASU 2016-02, Leases (codified as “ASC 842”). ASC 842 requires a lessee to record on the balance sheet the assets and liabilities for the rights and obligations created by leases with lease terms of more than 12 months. In addition, this standard requires both lessees and lessors to disclose certain key information about lease transactions. This standard will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently assessing the impact the adoption of ASC 842 will have on its condensed consolidated balance sheet, results of operations, and cash flow.

In February 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU provides an option to reclassify stranded tax effects within accumulated other comprehensive income (“AOCI”) to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the 2017 U.S. Tax Cuts and Job Act (or portion thereof) is recorded. This ASU requires disclosure of a description of the accounting policy for releasing income tax effects from AOCI; whether election is made to reclassify the stranded income tax effects from the 2017 U.S. Tax Cuts and Job Act; and information about the income tax effects that are reclassified. This ASU is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact the adoption of ASU 2018-02 will have on its condensed consolidation balance sheet, results of operations, and cash flow.

Revenue

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue

2. Revenue

Revenue Recognition

In accordance with ASC 606 revenue is recognized upon transfer of control of promised products and/or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products and services. Revenue is recognized net of any taxes collected from customers and subsequently remitted to governmental authorities.

Contract Combination. The Company may execute more than one contract or agreement with a single customer. The separate contracts or agreements may be viewed as one combined arrangement or separate agreements for revenue recognition purposes. In order to reach appropriate conclusions regarding whether such agreements should be combined, the Company evaluates whether the agreements were negotiated as a package with a single commercial objective, whether the amount of consideration to be paid in one agreement depends on the price and/or performance of another agreement, or whether the good or services promised in the agreements represent a single performance obligation. The conclusions reached can impact the allocation of the transaction price to each performance obligation and the timing of revenue recognition related to those arrangements.

Software as a Service (“SaaS”) and Platform as a Service (“PaaS”) Arrangements. The Company’s SaaS-based and PaaS-based arrangements, including implementation, support and other services, represent a single promise to provide continuous access (i.e. a stand-ready performance obligation) to its software solutions and their processing capabilities in the form of a service through one of the Company’s data centers. As each day of providing access to the software solution(s) is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, the Company’s single promise under its SaaS-based and PaaS-based arrangements is comprised of a series of distinct service periods. The Company’s SaaS-based and PaaS-based arrangements may include fixed consideration, variable consideration or a combination of the two. Fixed consideration is recognized over the term of the arrangement or longer if the fixed consideration relates to a material right. Variable consideration in these arrangements is typically a function of transaction volume or another usage-based measure. Depending upon the structure of a particular arrangement, the Company: (1) allocates the variable amount to each distinct service period within the series and recognizes revenue as each distinct service period is performed (i.e. direct allocation), (2) estimates total variable consideration at contract inception (giving consideration to any constraints that may apply and updating the estimates as new information becomes available) and recognizes the total transaction price over the period to which it relates, or (3) applies the ‘right to invoice’ practical expedient and recognizes revenue based on the amount invoiced to the customer during the period.

License Arrangements. The Company’s software license arrangements provide the customer with the right to use functional intellectual property (as it exists at the point in time at which the license is granted) for the duration of the contract term. Implementation, support, and other services are typically considered distinct performance obligations when sold with a software license unless these services are determined to significantly modify the software.

Payment terms for the Company’s software license arrangements generally include fixed license and capacity fees that are payable up front or over time. These arrangements may also include incremental usage-based fees that are payable when the customer exceeds its contracted license capacity limits. The Company accounts for capacity overages as a usage-based royalty that is recognized when the usage occurs.

When a software license arrangement contains payment terms that are extended beyond one year, a significant financing component may exist. The significant financing component is calculated as the difference between the stated value and present value of the software license fees and is recognized as interest income over the extended payment period. The total fixed software license fee net of the significant financing component is recognized as revenue at the point in time when the software is transferred to the customer.

For those software license arrangements that include customer-specific acceptance provisions, such provisions are generally presumed to be substantive and the Company does not recognize revenue until the earlier of the receipt of a written customer acceptance, objective demonstration that the delivered product meets the customer-specific acceptance criteria or the expiration of the acceptance period. The Company recognizes revenues on such arrangements upon the earlier of receipt of written acceptance or the first production use of the software by the customer.

For software license arrangements in which the Company acts as a distributor of another company’s product, and in certain circumstances, modifies or enhances the product, revenues are recorded on a gross basis. These include arrangements in which the Company takes control of the products and is responsible for providing the product or service. For software license arrangements in which the Company acts as a sales agent for another company’s product, revenues are recorded on a net basis. These include arrangements in which the Company does not take control of products and is not responsible for providing the product or service.

For software license arrangements in which the Company utilizes a third-party distributor or sales agent, the Company recognizes revenue upon transfer of control of the software license(s) to the third-party distributor or sales agent.

The Company’s software license arrangements typically provide the customer with a standard 90-day assurance-type warranty. These warranties do not represent an additional performance obligation as services beyond assuring that the software license complies with agreed-upon specifications are not provided.

Software license arrangements typically include an initial post contract customer support (maintenance or “PCS”) term of one year with subsequent renewals for additional years within the initial license period. The Company’s promise to those customers who elect to purchase PCS represents a stand-ready performance obligation that is distinct from the license performance obligation and recognized over the PCS term.

The Company also provides various professional services to customers with software licenses. These include project management, software implementation and software modification services. Revenues from arrangements to provide professional services are generally distinct from the other promises in the contract(s) and are recognized as the related services are performed. Consideration payable under these arrangements is either fixed fee or on a time-and-materials basis, which represents variable consideration that must be estimated using the most likely amount based on the range of hours expected to be incurred in providing the services.

The Company estimates the standalone selling price (“SSP”) for maintenance and professional services based on observable standalone sales. The Company applies the residual approach to estimate the SSP for software licenses.

Refer to Note 10, Segment Information, for further details, including disaggregation of revenue based on primary solution category and geographic location.

Significant Judgments

The Company applies judgment in determining the customer’s ability and intention to pay, which is based on a variety of factors including the customer’s historical payment experience or, in the case of a new customer, published credit and financial information. The Company also applies judgment in determining the term of an arrangement when early termination rights are provided to the customer.

The Company’s software license arrangements with its customers often include multiple promises to transfer licensed software products and services. Determining whether the products and/or services are distinct performance obligations that should be accounted for separately may require significant judgment.

The Company’s SaaS and PaaS arrangements may include variable consideration in the form of usage-based fees. If the arrangement that includes variable consideration in the form of usage-based fees does not meet the allocation exception for variable consideration, the Company estimates the amount of variable consideration at the outset of the arrangement using either the expected value or most likely amount method, depending on the specifics of each arrangement. These estimates are constrained to the extent that it is probable that a significant reversal of incremental revenue will not occur and are updated each reporting period as additional information becomes available.

Judgment is used in determining: (1) whether the financing component in a software license agreement is significant and, if so, (2) the discount rate used in calculating the significant financing component. The Company assesses the significance of the financing component based on the ratio of license fees paid over time to total license fees. If determined to be significant, the financing component is calculated using a rate that discounts the license fees to the cash selling price.

Judgment is also used in assessing whether the extension of payment terms in a software license arrangement results in variable consideration and, if so, the amount to be included in the transaction price. The Company applies the portfolio approach to estimating the amount of variable consideration in these arrangements using the most likely amount method that is based on the Company’s historical collection experience under similar arrangements.

Significant judgment is required to determine the SSP for each performance obligation, the amount allocated to each performance obligation and whether it depicts the amount that the Company expects to receive in exchange for the related product and/or service. As the selling prices of the Company’s software licenses are highly variable, the Company estimates SSP of its software licenses using the residual approach when the software license is sold with other services and observable SSPs exist for the other services. The Company uses a range of amounts to estimate SSP for maintenance and services. These ranges are based on standalone sales and vary based on the type of service and geographic region. If the SSP of a performance obligation is not directly observable, the Company will maximize observable inputs to determine its SSP.

Contract Balances

Timing of revenue recognition may differ from the timing of invoicing to customers. The Company records an accrued receivable when revenue is recognized prior to invoicing and the Company’s right to consideration only requires the passage of time, or deferred revenue when revenue is recognized subsequent to invoicing.

Total receivables represent amounts billed and amounts earned that are to be billed in the future (i.e., accrued receivables). Included in accrued receivables are services and SaaS and PaaS revenues earned in the current period but billed in the following period and amounts due under multi-year software license arrangements with extended payment terms for which the Company has an unconditional right to invoice and receive payment in the future.


	March 31,			December 31,
(in thousands)	2018			2017
Billed Receivables	$	175,066		$	240,137
Allowance for doubtful accounts		(4,001	)		(4,799	)

Billed Receivables, net	$	171,065		$	235,338

Accrued receivables		328,546			27,507
Significant financing component		(34,109	)		—

Total accrued receivables, net		294,437			27,507
Less current accrued receivables		117,276			27,507
Less current significant financing component		(9,972	)		—

Total long-term accrued receivables, net	$	187,133		$	—

Total receivables, net	$	465,502		$	262,845

No customer accounted for more than 10% of the Company’s consolidated receivables balance as of March 31, 2018 or December 31, 2017.

Deferred revenue includes amounts due or received from customers for software licenses, maintenance, services and/or SaaS and PaaS services in advance of recording the related revenue.

Changes in deferred revenue were as follows:


	Deferred
(in thousands)	Revenue
Balance, January 1, 2018	$	145,344
Deferral of revenue		56,264
Recognition of deferred revenue		(44,589	)

Balance, March 31, 2018	$	157,019

Revenue allocated to remaining performance obligations represents contracted revenue that will be recognized in future periods, which is comprised of deferred revenue and amounts that will be invoiced and recognized as revenue in future periods. This does not include:

(1)

Revenue that will be recognized in future periods from capacity overages that are accounted for as a usage-based royalty.

(2)

SaaS and PaaS revenue from variable consideration that will be recognized in accordance with the ‘right to invoice’ practical expedient.

(3)

SaaS and PaaS revenue from variable consideration that will be recognized in accordance with the direct allocation method.

Revenue allocated to remaining performance obligations was $589.5 million as of March 31, 2018, of which the Company expects to recognize approximately 50% over the next 12 months and the remainder thereafter.

During the three-months ended March 31, 2018, the revenue recognized by the Company from performance obligations satisfied in previous periods was not material.

Costs to Obtain and Fulfill a Contract

The Company accounts for costs to obtain and fulfill its contracts in accordance with ASC 340, Other Assets and Deferred Costs.

The Company capitalizes certain of its sales commissions that meet the definition of incremental costs of obtaining a contract and for which the amortization period is greater than one year. The costs associated with those sales commissions is capitalized during the period in which the Company becomes obligated to pay the commissions and is amortized over the period in which the related products or services are transferred to the customer. As of March 31, 2018, $0.4 million and $19.1 million of these costs are included in other current and other non-current assets, respectively, on the condensed consolidated balance sheets. During the three months ended March 31, 2018, the Company recognized $2.3 million of sales commission expense related to the amortization of these costs which is included in selling and marketing expense.

The Company capitalizes costs incurred to fulfill its contracts that: (1) relate directly to the arrangement, (2) are expected to generate resources that will be used to satisfy the Company’s performance obligation under the arrangement, and (3) are expected to be recovered through revenue generated under the arrangement. Contract fulfillment costs are expensed as the Company transfers the related services to the customer. As of March 31, 2018, $0.2 million and $12.0 million of these costs are included in other current and other non-current assets, respectively, on the condensed consolidated balance sheets. The amounts capitalized primarily relate to direct costs that enhance resources under the Company’s SaaS and PaaS arrangements. During the three months ended March 31, 2018, the Company recognized $1.2 million, of expense related to the amortization of these costs which is included in cost of revenue.

Financial Statement Effect of Applying ASC 606

As the modified retrospective transition method does not result in recast of the prior year financial statements, ASC 606 requires the Company to provide additional disclosures for the amount by which each financial statement line item is affected by adoption of the standard and explanation of the reasons for significant changes.

The financial statement line items affected by adoption of ASC 606 is as follows:


	March 31, 2018
(in thousands)	As Reported		Without application of ASC 606		Effect of Change Higher / (Lower)
Assets
Receivables, net of allowances	$	278,369	$	205,165	$	73,204
Recoverable income taxes		7,673		6,538		1,135
Prepaid expenses		29,961		30,702		(741	)
Other current assets		29,010		28,795		215
Accrued receivables, net		187,133		—		187,133
Deferred income taxes, net		22,109		65,503		(43,394	)
Other noncurrent assets		56,826		38,945		17,881

Liabilities
Deferred revenue		111,639		128,304		(16,665	)
Income taxes payable		6,178		6,268		(90	)
Other current liabilities		64,312		64,546		(234	)
Deferred income taxes, net		26,564		7,876		18,688

Stockholders’ equity
Total stockholders’ equity		979,022		745,288		233,734


	For the Three Months Ended March 31, 2018
(in thousands)	As Reported			Without application of ASC 606			Effect of Change Higher / (Lower)
Revenues
Software as a service and platform as a service	$	104,280		$	105,174		$	(894	)
License		28,046			43,921			(15,875	)
Maintenance		56,659			55,771			888
Services		20,325			20,029			296

Operating expenses
Selling and marketing		31,893			30,346			1,547

Other income (expense)
Interest income		2,744			179			2,565
Other, net		(55	)		(784	)		729

Income tax provision
Income tax benefit		(3,952	)		(2,043	)		(1,909	)

The following summarizes the significant changes resulting from the adoption of ASC 606 compared to if the Company had continued to recognize revenues under ASC 985-605, Revenue Recognition: Software (ASC 605).

Receivables, Deferred Revenue, License Revenue, and Interest Income

The change in receivables, deferred revenue, license revenue, and interest income is due to a change in the timing and the amount of recognition for software license revenues under ASC 606.

Under ASC 605, the Company recognizes revenue upon delivery provided (i) there is persuasive evidence of an arrangement, (ii) collection of the fee is considered probable, and (iii) the fee is fixed or determinable. For software license arrangements in which a significant portion of the fee is due more than 12 months after delivery or when payment terms are significantly beyond the Company’s standard business practice, the license fee is deemed not fixed or determinable. For software license arrangements in which the fee is not considered fixed or determinable, the license is recognized as revenue as payments become due and payable, provided all other conditions for revenue recognition have been met.

License revenue under ASC 605 includes revenue from software license arrangements with extended payment terms for which the due and payable pattern of recognition was applied. Under ASC 606, license revenue from these software license arrangements is accelerated (i.e. upfront recognition) and adjusted for the effects of the financing component, if significant. The significant financing component in these software license arrangements is recognized as interest income over the extended payment period. As many of these software license arrangements were active as of the date the Company adopted ASC 606, the license fees are included in the Company’s cumulative adjustment to retained earnings.

Other Current Assets, Other Noncurrent Assets, and Selling and Marketing

Under ASC 606, certain of the Company’s sales commissions meet the definition of incremental costs of obtaining a contract. Accordingly, these costs are capitalized and the expense is recognized as the related goods or services are transferred to the customer. Prior to the adoption of ASC 606, the Company recognized sales commission expenses as they were incurred.

Deferred Income Taxes, Net

The change in deferred income taxes is primarily due to the deferred tax effects resulting from the adjustment to retained earnings for the cumulative effect of applying ASC 606 to active contracts as of the adoption date.

The adoption of ASC 606 had no impact in total on the Company’s cash flows from operations.

Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

3. Debt

As of March 31, 2018, the Company had $389.1 million and $300.0 million outstanding under Term Credit Facility and Senior Notes, respectively, with up to $500.0 million of unused borrowings under the Revolving Credit Facility portion of the Credit Agreement, as amended.

Credit Agreement

On February 24, 2017, the Company entered into an amended and restated credit agreement (the “Credit Agreement”), replacing the existing agreement, with a syndicate of financial institutions, as lenders, and Bank of America, N.A. (“BofA”), as Administrative Agent, providing for revolving loans, swingline loans, letters of credit, and a term loan. The Credit Agreement consists of a five-year $500.0 million senior secured revolving credit facility (the “Revolving Credit Facility”), which includes a sublimit for the issuance of standby letters of credit and a sublimit for swingline loans, and $415.0 million under the five-year senior secured term loan facility (the “Term Credit Facility” and, together with the Revolving Credit Facility, the “Credit Facility”). The Credit Agreement also allows the Company to request optional incremental term loans and increases in the revolving commitment.

The loans under the Credit Facility may be made to, and the letters of credit under the Revolving Credit Facility may be issued on behalf of the Company. On February 24, 2017, the Company borrowed an aggregate principal amount of $12.0 million under the Revolving Credit Facility and borrowed $415.0 million under the Term Credit Facility.

Borrowings under the Credit Facility bear interest at a rate per annum equal to, at the Company’s option, either (a) a base rate determined by reference to the highest of (1) the rate of interest per annum publicly announced by the Administrative Agent as its Prime Rate, (2) the federal funds effective rate plus 1/2 of 1% and (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for a one-month interest period adjusted for certain additional costs plus 1% or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, in each case plus an applicable margin. The applicable margin for borrowings under the Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.25% to 1.25% with respect to base rate borrowings and between 1.25% and 2.25% with respect to LIBOR rate borrowings. Interest is due and payable monthly. The interest rate in effect at March 31, 2018 for the Credit Facility was 3.63%.

In addition to paying interest on the outstanding principal under the Credit Facility, the Company is required to pay a commitment fee in respect of the unutilized commitments under the Revolving Credit Facility, payable quarterly in arrears. The Company is also required to pay letter of credit fees on the maximum amount available to be drawn under all outstanding letters of credit in an amount equal to the applicable margin on LIBOR rate borrowings under the Revolving Credit Facility on a per annum basis, payable quarterly in arrears, as well as customary fronting fees for the issuance of letters of credit fees and agency fees.

The Company’s obligations under the Credit Facility and cash management arrangements entered into with lenders under the Credit Facility (or affiliates thereof) and the obligations of the subsidiary guarantors are secured by first-priority security interests in substantially all assets of the Company and any guarantor, including 100% of the capital stock of ACI Worldwide Corp. and each domestic subsidiary of the Company, each domestic subsidiary of any guarantor, and 65% of the voting capital stock of each foreign subsidiary of the Company that is directly owned by the Company or a guarantor, in each case subject to certain exclusions set forth in the credit documentation governing the Credit Facility.

The Credit Agreement contains a number of covenants that, among other things and subject to certain exceptions, restrict the Company’s ability and, as applicable, the ability of its subsidiaries to: create, incur, assume or suffer to exist any additional indebtedness; create, incur, assume or suffer to exist any liens; enter into agreements and other arrangements that include negative pledge clauses; pay dividends on capital stock or redeem, repurchase or retire capital stock or subordinated indebtedness; create restrictions on the payment of dividends or other distributions by subsidiaries; make investments, loans, advances and acquisitions; merge, consolidate or enter into any similar combination or sell assets, including equity interests of the subsidiaries; enter into sale and leaseback transactions; directly or indirectly engage in transactions with affiliates; alter in any material respect the character or conduct of the business; enter into amendments of or waivers under subordinated indebtedness, organizational documents and certain other material agreements; and hold certain assets and incur certain liabilities.

The Credit Agreement also contains certain customary affirmative covenants and events of default. If an event of default, as specified in the Credit Agreement, shall occur and be continuing, the Company may be required to repay all amounts outstanding under the Credit Facility.

Senior Notes

On August 20, 2013, the Company completed a $300.0 million offering of Senior Notes at an issue price of 100% of the principal amount in a private placement for resale to qualified institutional buyers. The Senior Notes bear an interest rate of 6.375% per annum, payable semi-annually in arrears on August 15 and February 15 of each year, commencing on February 15, 2014. Interest began accruing on August 20, 2013.

Maturities on long-term debt outstanding at March 31, 2018 are as follows:


Fiscal year ending December 31,
(in thousands)
2018	$	15,563
2019		31,125
2020		331,125
2021		41,500
2022		269,750

Total	$	689,063

The Credit Agreement and Senior Notes also contain certain customary mandatory prepayment provisions. If certain events, as specified in the Credit Agreement or Senior Notes agreement, shall occur, the Company may be required to repay all or a portion of the amounts outstanding under the Credit Facility or Senior Notes.

The Credit Facility will mature on February 24, 2022 and the Senior Notes will mature on August 15, 2020. The Revolving Credit Facility and Senior Notes do not amortize and the Term Credit Facility does amortize, with principal payable in consecutive quarterly installments.

The Credit Agreement and Senior Notes contain certain customary affirmative covenants and negative covenants that limit or restrict, subject to certain exceptions, the incurrence of liens, indebtedness of subsidiaries, mergers, advances, investments, acquisitions, transactions with affiliates, change in nature of business and the sale of the assets. The Company is also required to maintain a consolidated leverage ratio at or below a specified amount and an interest coverage ratio at or above a specified amount. If an event of default, as specified in the Credit Agreement and Senior Notes agreement, shall occur and be continuing, the Company may be required to repay all amounts outstanding under the Credit Facility and Senior Notes. As of March 31, 2018, and at all times during the period, the Company was in compliance with its financial debt covenants.


(in thousands)	As of March 31, 2018			As of December 31, 2017
Term credit facility	$	389,063		$	394,250
Revolving credit facility		—			2,000
6.375% Senior Notes, due August 2020		300,000			300,000
Debt issuance costs		(9,823	)		(10,521	)

Total debt		679,240			685,729
Less current portion of term credit facility		23,344			20,750
Less current portion of debt issuance costs		(2,965	)		(2,964	)

Total long-term debt	$	658,861		$	667,943

Stock-Based Compensation Plans

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Plans

4. Stock-Based Compensation Plans

Employee Stock Purchase Plan

On April 6, 2017, the Board of Directors approved the 2017 Employee Stock Purchase Plan (“2017 ESPP”), which was approved by shareholders at the 2017 Annual Shareholder meeting. The 2017 ESPP provides employees with an opportunity to purchase shares of common stock in the Company. The 1999 Employee Stock Purchase Plan terminated upon the August 1, 2017 effective date of the 2017 ESPP. Under the Company’s 2017 ESPP a total of 3,000,000 shares of the Company’s common stock have been reserved for issuance to eligible employees. Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation, for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter. The price for shares of common stock purchased under the ESPP is 85% of the stock’s fair market value on the last business day of the three-month participation period. Shares issued under the ESPP during the three-months ended March 31, 2018 and 2017, totaled 38,145 and 44,685, respectively.

Stock-Based Payments

A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:


	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value of In-the-Money Options
Outstanding as of December 31, 2017		6,162,717		$	16.83
Granted		170,455			23.36
Exercised		(656,898	)		13.88
Forfeited		(3,255	)		17.89

Outstanding as of March 31, 2018		5,673,019		$	17.37		6.74	$	36,025,874

Exercisable as of March 31, 2018		4,081,780		$	16.58		6.11	$	29,135,028

The weighted-average grant date fair value of stock options granted during the three months ended March 31, 2018 and 2017 was $7.03 and $6.24, respectively. The Company issued treasury shares for the exercise of stock options during the three months ended March 31, 2018 and 2017. The total intrinsic value of stock options exercised during the three months ended March 31, 2018 and 2017 was $7.2 million and $4.6 million, respectively.

The fair value of options that do not vest based on the achievement of certain market conditions granted during the three months ended March 31, 2018 and 2017 were estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:


	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Expected life (years)		5.6			5.6
Interest rate		2.7	%		1.9	%
Volatility		26.4	%		29.4	%
Dividend yield		—			—

Expected volatilities are based on the Company’s historical common stock volatility derived from historical stock price data for historical periods commensurate with the options’ expected life. The expected life is the average number of years that the Company estimated that the options will be outstanding, based primarily on historical employee option exercise behavior. The risk-free interest rate is based on the implied yield currently available on United States Treasury zero coupon issues with a term equal to the expected term at the date of grant of the options. The expected dividend yield is zero as the Company has historically paid no dividends and does not anticipate dividends to be paid in the future.

Long-term Incentive Program Performance Share Awards

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of March 31, 2018 and changes during the period are as follows:


Nonvested LTIP Performance Shares	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		1,125,035		$	18.94
Forfeited		(8,008	)		19.57

Nonvested as of March 31, 2018		1,117,027		$	18.94

Restricted Share Awards

A summary of nonvested restricted share awards (“RSAs”) as of March 31, 2018 and changes during the period are as follows:


Nonvested Restricted Share Awards	Number of Restricted Share Awards			Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2017		503,237		$	20.63
Vested		(123,427	)		20.12
Forfeited		(10,727	)		20.12

Nonvested as of March 31, 2018		369,083		$	20.81

During the three-months ended March 31, 2018, the Company had 123,427 RSA shares vested. The Company withheld 40,335 of those shares to pay the employees’ portion of the minimum payroll withholding taxes.

Performance-Based Restricted Share Awards

A summary of nonvested Performance-Based Restricted Share Awards (“PBRSAs”) as of March 31, 2018 and changes during the period are as follows:


Nonvested Performance-Based Restricted Share Awards	Number of Performance-Based Restricted Share Awards		Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2017		173,636	$	24.41

Nonvested as of March 31, 2018		173,636	$	24.41

Total Shareholder Return Awards

During the three-months ended March 31, 2018 and 2017, the Company granted total shareholder return (“TSR”) awards, pursuant to the 2016 Equity and Performance Incentive Plan. TSRs are performance shares that are earned, if at all, based upon the Company’s total shareholder return as compared to a group of peer companies over a three-year performance period. The award payout can range from 0% to 200%. In order to determine the grant date fair value of the TSRs, a Monte Carlo simulation model is used. The Company recognizes compensation expense for TSRs over a three-year performance period based on the grant date fair value.

The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:


	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Expected life (years)		2.9			2.9
Interest rate		2.4	%		1.5	%
Volatility		28.0	%		26.5	%
Dividend Yield		—			—

A summary of nonvested TSRs outstanding as of March 31, 2018 and changes during the period are as follows:


Nonvested Total Shareholder Return Awards	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		143,649		$	24.37
Granted		541,214			31.31
Forfeited		(1,837	)		31.31

Nonvested as of March 31, 2018		683,026		$	29.85

Restricted Share Units

During the three months ended March 31, 2018, the Company granted restricted share units (“RSUs”) awards, pursuant to the 2016 Equity and Performance Incentive Plan. The awards have requisite service periods of three years and vest in increments of 33% on the anniversary of the grant dates. Under each arrangement, stock is issued without direct cost to the employee on the vesting date. The Company estimates the fair value of the RSUs based upon the market price of the Company’s stock at the date of grant. The Company recognizes compensation expense for RSUs on a straight-line basis over the requisite service period.

A summary of nonvested RSUs as of March 31, 2018 and changes during the period are as follows:


Nonvested Restricted Share Units	Number of Restricted Share Units			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		—		$	—
Granted		581,945			23.36
Forfeited		(2,461	)		23.36

Nonvested as of March 31, 2018		579,484		$	23.36

As of March 31, 2018, there were unrecognized compensation costs of $18.5 million related to the TSRs, $13.1 million related to RSUs, $9.8 million related to the LTIP performance shares, $7.6 million related to nonvested stock options, $5.5 million related to the nonvested RSAs, and $0.3 million related to nonvested PBRSAs, which the Company expects to recognize over weighted-average periods of 2.8 years, 2.9 years, 1.7 years, 1.2 years, 1.8 years, and 0.2 years, respectively.

The Company recorded stock-based compensation expenses recognized under ASC 718, Compensation – Stock Compensation, for the three months ended March 31, 2018 and 2017 related to stock options, LTIP performance shares, RSAs, PBRSAs, TSR shares, RSUs and the ESPP of $6.4 million and $6.3 million, respectively, with corresponding tax benefits of $1.0 million and $2.2 million, respectively. The Company recognizes compensation costs for stock option awards that vest with the passage of time with only service conditions on a straight-line basis over the requisite service period. The Company recognizes compensation costs for stock option awards that vest with service and market-based conditions on a straight-line basis over the longer of the requisite service period or the estimated period to meet the defined market-based condition.

Software and Other Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Software and Other Intangible Assets

5. Software and Other Intangible Assets

At March 31, 2018, software net book value totaling $150.7 million, net of $236.8 million of accumulated amortization, includes the net book value of software marketed for external sale of $37.9 million. The remaining software net book value of $112.8 million is comprised of various software that has been acquired or developed for internal use.

At December 31, 2017, software net book value totaled $155.4 million, net of $230.7 million of accumulated amortization. Included in this amount is software marketed for external sale of $40.9 million. The remaining software net book value of $114.5 million is comprised of various software that has been acquired or developed for internal use.

Quarterly amortization of software marketed for external sale is computed using the greater of the ratio of current revenues to total estimated revenues expected to be derived from the software or the straight-line method over an estimated useful life of three to ten years. Software for resale amortization expense recorded in the three months ended March 31, 2018 and 2017 totaled $3.6 million and $3.3 million, respectively. These software amortization expense amounts are reflected in cost of revenue in the condensed consolidated statements of operations.

Quarterly amortization of software for internal use is computed using the straight-line method over an estimated useful life of three to ten years. Software for internal use includes software acquired through acquisitions that is used to provide certain of our SaaS and PaaS offerings. Amortization of software for internal use of $10.5 million and $11.3 million for the three months ended March 31, 2018 and 2017, respectively, is included in depreciation and amortization in the condensed consolidated statements of operations.

The carrying amount and accumulated amortization of the Company’s other intangible assets that were subject to amortization at each balance sheet date are as follows:


(in thousands)	March 31, 2018							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Balance		Gross Carrying Amount		Accumulated Amortization			Net Balance
Customer relationships	$	308,489	$	(122,164	)	$	186,325	$	305,218	$	(116,677	)	$	188,541
Trademarks and tradenames		16,842		(14,479	)		2,363		16,646		(13,906	)		2,740

	$	325,331	$	(136,643	)	$	188,688	$	321,864	$	(130,583	)	$	191,281

Other intangible assets amortization expense for the three months ended March 31, 2018 and 2017 totaled $4.9 million and $4.8 million, respectively.

Based on capitalized software and other intangible assets at March 31, 2018, estimated amortization expense for future fiscal years is as follows:


Fiscal Year Ending December 31,	Software Amortization		Other Intangible Assets Amortization
(in thousands)
Remainder of 2018	$	38,406	$	14,410
2019		42,955		18,777
2020		33,127		17,866
2021		20,461		17,342
2022		8,780		17,184
2023		4,640		16,854
Thereafter		2,284		86,255

Total	$	150,653	$	188,688

Corporate Restructuring and Other Organizational Changes

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Corporate Restructuring and Other Organizational Changes

6. Corporate Restructuring and Other Organizational Changes

The components of corporate restructuring and other reorganization activities are included in the following table:


(in thousands)	Facility Closures
Balance, December 31, 2017	$	5,945
Amounts paid during the period		(455	)
Foreign currency translation		79

Balance, March 31, 2018	$	5,569

Of the $5.6 million facility closure liability, $1.8 million and $3.8 million is recorded in other current and noncurrent liabilities, respectively, in the accompanying condensed consolidated balance sheet at March 31, 2018.

Common Stock and Treasury Stock	3 Months Ended
Common Stock and Treasury Stock	Mar. 31, 2018
Equity [Abstract]
Common Stock and Treasury Stock	7. Common Stock and Treasury Stock In 2005, the Company’s Board of Directors (“the Board”) approved a stock repurchase program authorizing the Company, as market and business conditions warrant, to acquire its common stock and periodically authorizes additional funds for the program. In February 2018, the Board approved $200.0 million for the stock repurchase program. The Company repurchased 1,346,427 shares for $31.1 million under the program during the three months ended March 31, 2018. Under the program to date, the Company has repurchased 43,129,393 shares for approximately $524.4 million. The maximum remaining authorized for purchase under the stock repurchase program was $200.0 million as of March 31, 2018.

Loss Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Loss Per Share

8. Loss Per Share

Basic loss per share is computed on the basis of weighted average outstanding common shares. Diluted loss per share is computed on the basis of basic weighted average outstanding common shares adjusted for the dilutive effect of stock options and other outstanding dilutive securities.

The following table reconciles the average share amounts used to compute both basic and diluted loss per share (in thousands):


	Three Months Ended March 31,
	2018		2017
Weighted average shares outstanding:
Basic weighted average shares outstanding		115,642		116,610
Add: Dilutive effect of stock options		—		—

Diluted weighted average shares outstanding		115,642		116,610

The diluted loss per share computation excludes 8.6 million and 10.5 million options to purchase shares, contingently issuable shares, and restricted share awards during the three months ended March 31, 2018 and 2017, respectively, as their effect would be anti-dilutive.

Common stock outstanding as of March 31, 2018 and December 31, 2017 was 116,394,285 and 117,096,731, respectively.

Other, net	3 Months Ended
Other, net	Mar. 31, 2018
Other Income and Expenses [Abstract]
Other, net	9. Other, net Other is comprised of foreign currency transaction gains (losses) of $(0.1) million and $0.6 million for the three months ended March 31, 2018 and 2017, respectively.

Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

10. Segment Information

The Company reports financial performance based on its segments, ACI On Premise and ACI On Demand, and analyzes Segment Adjusted EBITDA as a measure of segment profitability.

The Company’s chief operating decision maker (“CODM”), which is also our Chief Executive Officer, together with other senior management personnel, focus their review of consolidated financial information and the allocation of resources based upon the operating results, including revenues and Segment Adjusted EBITDA, for the segments ACI On Premise and ACI On Demand, separate from the Corporate operations.

ACI On Premise serves customers who manage their software on site. These on premise customers use the Company’s software to develop sophisticated solutions, which are often part of a larger system located and managed at the customer site. These customers require a level of control and flexibility that ACI On Premise solutions can offer, and they have the resources and expertise to take a lead role in managing these solutions.

ACI On Demand serves the needs of retail and financial institutions who use payments to facilitate their core business. The Company sees an increasing number of customers opting for SaaS and PaaS offerings, which offer reduced complexity and cost as well as the ability to rapidly implement and scale.

Revenue is attributed to the reportable segments based upon the product sold and mechanism for delivery to the customer. Expenses are attributed to the reportable segments in one of three methods, (1) direct costs of the segment, (2) labor costs that can be attributed based upon time tracking for individual products, or (3) costs that are allocated. Allocated costs are generally marketing and sales related activities as well as information technology and facilities related expense for which multiple segments benefit. The Company also allocates certain depreciation costs to the segments.

Segment Adjusted EBITDA is the measure reported to the CODM for purposes of making decisions on allocating resources and assessing the performance of the Company’s segments and, therefore, Segment Adjusted EBITDA is presented in conformity with ASC 280, Segment Reporting. Segment Adjusted EBITDA is defined as earnings (loss) from operations before interest, income tax expense (benefit), depreciation and amortization (“EBITDA”) adjusted to exclude stock-based compensation, and net other income (expense). During the first quarter of 2018, the Company changed the presentation of its segment measure of profit and loss. As a result the 2017 segment disclosure has been recast to conform with the 2018 presentation.

Corporate and other unallocated expenses consists of the corporate overhead costs that are not allocated to reportable segments. These overhead costs relate to human resources, finance, legal, accounting, merger and acquisition activity, and other costs that are not considered when management evaluates segment performance.

The following is selected financial data for the Company’s reportable segments (in thousands):


	Three Months Ended
	March 31, 2018			March 31, 2017
Revenue
ACI On Premise	$	105,030		$	131,908
ACI On Demand		104,280			99,554

Total revenue	$	209,310		$	231,462

Segment Adjusted EBITDA
ACI On Premise	$	38,898		$	68,395
ACI On Demand		(4,233	)		(7,007	)
Depreciation and amortization		(24,993	)		(25,638	)
Stock-based compensation		(6,362	)		(6,297	)
Corporate and unallocated expenses		(20,014	)		(25,830	)
Interest, net		(6,621	)		(10,054	)
Other, net		(55	)		649

Loss before income taxes	$	(23,380	)	$	(5,782	)

Depreciation and amortization
ACI On Premise	$	2,975		$	3,261
ACI On Demand		7,736			8,388
Corporate		14,282			13,989

Total depreciation and amortization	$	24,993		$	25,638

Assets are not allocated to segments and the Company’s CODM does not evaluate operating segments using discrete asset information.

The following is selected financial data for the Company’s geographical areas and revenues by geographic location and primary solution category for the periods indicated (in thousands):


	Three Months Ended March 31, 2018						Three Months Ended March 31, 2017
(in thousands)	ACI On Premise		ACI On Demand		Total		ACI On Premise		ACI On Demand		Total
Primary Geographic Markets
Americas - United States		30,864		88,946		119,810		49,193		85,809		135,002
Americas - Other		16,784		2,319		19,103		14,874		2,252		17,126
EMEA		38,686		12,009		50,695		51,904		11,079		62,983
Asia Pacific		18,696		1,006		19,702		15,937		414		16,351

Total	$	105,030	$	104,280	$	209,310	$	131,908	$	99,554	$	231,462

Primary Solution Categories
Bill Payments		—		66,168		66,168		—		65,246		65,246
Digital Channels/Online		11,363		10,644		22,007		12,488		10,491		22,979
Merchant Payments		5,010		12,371		17,381		6,312		11,359		17,671
Payments Risk Management		10,420		11,798		22,218		5,160		10,308		15,468
Real Time Payments		13,641		450		14,091		13,548		195		13,743
Retail Payments		64,596		2,849		67,445		94,400		1,955		96,355

Total	$	105,030	$	104,280	$	209,310	$	131,908	$	99,554	$	231,462

The following is selected financial data for the Company’s long-lived assets by geographic location for the periods indicated (in thousands):


(in thousands)	March 31, 2018		December 31, 2017
Long lived assets
United States	$	854,156	$	759,513
Other		719,610		613,556

	$	1,573,766	$	1,373,069

No single customer accounted for more than 10% of the Company’s consolidated revenues during the three months ended March 31, 2018 and 2017. No other country outside the United States accounted for more than 10% of the Company’s consolidated revenues during the three months ended March 31, 2018 and 2017.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was signed into U.S. Law. In December 2017, the Securities and Exchange Commission staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. As of March 31, 2018, the Company has not completed its accounting for the tax effects of the enactment of the Tax Act; however, in certain cases, specifically as follows, the Company made a reasonable estimate of (i) the effects on its existing deferred tax balances and (ii) the effects of the one-time mandatory repatriation tax. The Company recognized a provisional tax expense of $35.9 million in the year ended December 31, 2017 associated with the items it could reasonably estimate. For the quarter ended March 31, 2018, the Company made an adjustment to its estimate related to executive compensation which resulted in $1.7 million of tax benefit. Due the timing of the release of the Tax Act, the complexity of the Tax Act and regulatory guidance that has recently been released and additional guidance expected to be released, the Company is still analyzing the Tax Act and refining its calculations, which could potentially impact the measurement of its income tax balances. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. At March 31, 2018, the Company has not yet determined its policy election with respect to whether to record deferred taxes for basis differences expected to reverse as a result of the Global Intangible Low-Taxed Income (“GILTI”) provisions in future periods or use the period cost method. The Company has recorded $1.3 million of tax expense in the three months ended March 31, 2018 for the current impact of the GILTI provisions. The effective tax rate for the three months ended March 31, 2018 was 17%. The losses of the Company’s foreign entities for the three months ended March 31, 2018 were $1.8 million. The effective tax rate for the three months ended March 31, 2018 was negatively impacted by losses in certain foreign jurisdictions taxed at lower rates and domestic taxes resulting from the current GILTI tax, partially offset by equity compensation tax benefits. The effective tax rate for the three months ended March 31, 2017 was 72%. The earnings of the Company’s foreign entities for the three months ended March 31, 2017 were $8.7 million. The effective tax rate for the three months ended March 31, 2017 was negatively impacted by profits in certain foreign jurisdictions taxed at lower rates and domestic losses taxed at higher rates, partially offset by losses in other foreign jurisdictions taxed at lower rates. The Company’s effective tax rate could fluctuate significantly on a quarterly basis and could be negatively affected to the extent earnings are lower in the countries in which it operates that have a lower statutory rate or higher in the countries in which it operates that have a higher statutory rate or to the extent it has losses sustained in countries where the future utilization of losses are uncertain. The Company’s effective tax rate could also fluctuate due to changes in the valuation of its deferred tax assets or liabilities, or by changes in tax laws, regulations, accounting principles, or interpretations thereof. In addition, the Company is occasionally subject to examination of its income tax returns by tax authorities in the jurisdictions it operates. The Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. The amount of unrecognized tax benefits for uncertain tax positions was $27.5 million as of March 31, 2018 and $27.2 million as of December 31, 2017, excluding related liabilities for interest and penalties of $1.2 million as of March 31, 2018 and December 31, 2017. The Company believes it is reasonably possible that the total amount of unrecognized tax benefits will decrease within the next 12 months by approximately $0.1 million, due to the settlement of various audits and the expiration of statutes of limitation. The Company continues to evaluate the potential foreign and U.S. state tax liabilities that would result from future repatriations from non-U.S. subsidiaries, if any, and how the Tax Act will affect our existing accounting position with regard to the indefinite reinvestment of undistributed foreign earnings.

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Loss

12. Accumulated Other Comprehensive Loss

Activity within accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017, which consists of foreign currency translation adjustments, were as follows:


(in thousands)	Accumulated other comprehensive loss
Balance at December 31, 2017	$	(77,356	)
Other comprehensive income		5,659

Balance at March 31, 2018	$	(71,697	)


	Accumulated other comprehensive loss
Balance at December 31, 2016	$	(94,100	)
Other comprehensive income		6,051

Balance at March 31, 2017	$	(88,049	)

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Other Current Assets and Other Current Liabilities

Other Current Assets and Other Current Liabilities


(in thousands)	March 31, 2018		December 31, 2017
Settlement deposits	$	8,905	$	22,282
Settlement receivables		11,883		30,063
Other		8,222		5,781

Total other current assets	$	29,010	$	58,126


(in thousands)	March 31, 2018		December 31, 2017
Settlement payables	$	20,245	$	48,953
Accrued interest		2,554		7,291
Vendor financed licenses		3,068		1,862
Royalties payable		9,883		9,264
Other		28,562		35,534

Total other current liabilities	$	64,312	$	102,904

Off Balance Sheet Accounts

Off Balance Sheet Accounts

Fair Value

Fair Value

The fair values of cash and cash equivalents approximate the carrying values due to the short period of time to maturity (Level 2 of the fair value hierarchy).

Goodwill

Goodwill

New Accounting Standards Recently Adopted

New Accounting Standards Recently Adopted

Recently Issued Accounting Standards Not Yet Effective

Recently Issued Accounting Standards Not Yet Effective

Revenue Recognition

Revenue Recognition

Refer to Note 10, Segment Information, for further details, including disaggregation of revenue based on primary solution category and geographic location.

Significant Judgments

Contract Balances


	March 31,			December 31,
(in thousands)	2018			2017
Billed Receivables	$	175,066		$	240,137
Allowance for doubtful accounts		(4,001	)		(4,799	)

Billed Receivables, net	$	171,065		$	235,338

Accrued receivables		328,546			27,507
Significant financing component		(34,109	)		—

Total accrued receivables, net		294,437			27,507
Less current accrued receivables		117,276			27,507
Less current significant financing component		(9,972	)		—

Total long-term accrued receivables, net	$	187,133		$	—

Total receivables, net	$	465,502		$	262,845

No customer accounted for more than 10% of the Company’s consolidated receivables balance as of March 31, 2018 or December 31, 2017.

Deferred revenue includes amounts due or received from customers for software licenses, maintenance, services and/or SaaS and PaaS services in advance of recording the related revenue.

Changes in deferred revenue were as follows:


	Deferred
(in thousands)	Revenue
Balance, January 1, 2018	$	145,344
Deferral of revenue		56,264
Recognition of deferred revenue		(44,589	)

Balance, March 31, 2018	$	157,019

(1)

Revenue that will be recognized in future periods from capacity overages that are accounted for as a usage-based royalty.

(2)

SaaS and PaaS revenue from variable consideration that will be recognized in accordance with the ‘right to invoice’ practical expedient.

(3)

SaaS and PaaS revenue from variable consideration that will be recognized in accordance with the direct allocation method.

During the three-months ended March 31, 2018, the revenue recognized by the Company from performance obligations satisfied in previous periods was not material.

Costs to Obtain and Fulfill a Contract

The Company accounts for costs to obtain and fulfill its contracts in accordance with ASC 340, Other Assets and Deferred Costs.

Financial Statement Effect of Applying ASC 606

The financial statement line items affected by adoption of ASC 606 is as follows:


	March 31, 2018
(in thousands)	As Reported		Without application of ASC 606		Effect of Change Higher / (Lower)
Assets
Receivables, net of allowances	$	278,369	$	205,165	$	73,204
Recoverable income taxes		7,673		6,538		1,135
Prepaid expenses		29,961		30,702		(741	)
Other current assets		29,010		28,795		215
Accrued receivables, net		187,133		—		187,133
Deferred income taxes, net		22,109		65,503		(43,394	)
Other noncurrent assets		56,826		38,945		17,881

Liabilities
Deferred revenue		111,639		128,304		(16,665	)
Income taxes payable		6,178		6,268		(90	)
Other current liabilities		64,312		64,546		(234	)
Deferred income taxes, net		26,564		7,876		18,688

Stockholders’ equity
Total stockholders’ equity		979,022		745,288		233,734


	For the Three Months Ended March 31, 2018
(in thousands)	As Reported			Without application of ASC 606			Effect of Change Higher / (Lower)
Revenues
Software as a service and platform as a service	$	104,280		$	105,174		$	(894	)
License		28,046			43,921			(15,875	)
Maintenance		56,659			55,771			888
Services		20,325			20,029			296

Operating expenses
Selling and marketing		31,893			30,346			1,547

Other income (expense)
Interest income		2,744			179			2,565
Other, net		(55	)		(784	)		729

Income tax provision
Income tax benefit		(3,952	)		(2,043	)		(1,909	)

Receivables, Deferred Revenue, License Revenue, and Interest Income

The change in receivables, deferred revenue, license revenue, and interest income is due to a change in the timing and the amount of recognition for software license revenues under ASC 606.

Other Current Assets, Other Noncurrent Assets, and Selling and Marketing

Deferred Income Taxes, Net

The adoption of ASC 606 had no impact in total on the Company’s cash flows from operations.

Loss per share

Segment Information

The Company reports financial performance based on its segments, ACI On Premise and ACI On Demand, and analyzes Segment Adjusted EBITDA as a measure of segment profitability.

Condensed Consolidated Financial Statements (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Components of Other Current Assets and Other Current Liabilities

Other Current Assets and Other Current Liabilities


(in thousands)	March 31, 2018		December 31, 2017
Settlement deposits	$	8,905	$	22,282
Settlement receivables		11,883		30,063
Other		8,222		5,781

Total other current assets	$	29,010	$	58,126


(in thousands)	March 31, 2018		December 31, 2017
Settlement payables	$	20,245	$	48,953
Accrued interest		2,554		7,291
Vendor financed licenses		3,068		1,862
Royalties payable		9,883		9,264
Other		28,562		35,534

Total other current liabilities	$	64,312	$	102,904

Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Total Receivables


	March 31,			December 31,
(in thousands)	2018			2017
Billed Receivables	$	175,066		$	240,137
Allowance for doubtful accounts		(4,001	)		(4,799	)

Billed Receivables, net	$	171,065		$	235,338

Accrued receivables		328,546			27,507
Significant financing component		(34,109	)		—

Total accrued receivables, net		294,437			27,507
Less current accrued receivables		117,276			27,507
Less current significant financing component		(9,972	)		—

Total long-term accrued receivables, net	$	187,133		$	—

Total receivables, net	$	465,502		$	262,845

Changes in Deferred Revenue

Changes in deferred revenue were as follows:


	Deferred
(in thousands)	Revenue
Balance, January 1, 2018	$	145,344
Deferral of revenue		56,264
Recognition of deferred revenue		(44,589	)

Balance, March 31, 2018	$	157,019

Financial Statement Effect of Applying ASC 606

The financial statement line items affected by adoption of ASC 606 is as follows:


	March 31, 2018
(in thousands)	As Reported		Without application of ASC 606		Effect of Change Higher / (Lower)
Assets
Receivables, net of allowances	$	278,369	$	205,165	$	73,204
Recoverable income taxes		7,673		6,538		1,135
Prepaid expenses		29,961		30,702		(741	)
Other current assets		29,010		28,795		215
Accrued receivables, net		187,133		—		187,133
Deferred income taxes, net		22,109		65,503		(43,394	)
Other noncurrent assets		56,826		38,945		17,881

Liabilities
Deferred revenue		111,639		128,304		(16,665	)
Income taxes payable		6,178		6,268		(90	)
Other current liabilities		64,312		64,546		(234	)
Deferred income taxes, net		26,564		7,876		18,688

Stockholders’ equity
Total stockholders’ equity		979,022		745,288		233,734


	For the Three Months Ended March 31, 2018
(in thousands)	As Reported			Without application of ASC 606			Effect of Change Higher / (Lower)
Revenues
Software as a service and platform as a service	$	104,280		$	105,174		$	(894	)
License		28,046			43,921			(15,875	)
Maintenance		56,659			55,771			888
Services		20,325			20,029			296

Operating expenses
Selling and marketing		31,893			30,346			1,547

Other income (expense)
Interest income		2,744			179			2,565
Other, net		(55	)		(784	)		729

Income tax provision
Income tax benefit		(3,952	)		(2,043	)		(1,909	)

Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Maturities on Long-Term Debt Outstanding

Maturities on long-term debt outstanding at March 31, 2018 are as follows:


Fiscal year ending December 31,
(in thousands)
2018	$	15,563
2019		31,125
2020		331,125
2021		41,500
2022		269,750

Total	$	689,063

Carrying Value of Debt

As of March 31, 2018, and at all times during the period, the Company was in compliance with its financial debt covenants.


(in thousands)	As of March 31, 2018			As of December 31, 2017
Term credit facility	$	389,063		$	394,250
Revolving credit facility		—			2,000
6.375% Senior Notes, due August 2020		300,000			300,000
Debt issuance costs		(9,823	)		(10,521	)

Total debt		679,240			685,729
Less current portion of term credit facility		23,344			20,750
Less current portion of debt issuance costs		(2,965	)		(2,964	)

Total long-term debt	$	658,861		$	667,943

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Stock Options Issued Pursuant to Stock Incentive Plans

A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:


	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value of In-the-Money Options
Outstanding as of December 31, 2017		6,162,717		$	16.83
Granted		170,455			23.36
Exercised		(656,898	)		13.88
Forfeited		(3,255	)		17.89

Outstanding as of March 31, 2018		5,673,019		$	17.37		6.74	$	36,025,874

Exercisable as of March 31, 2018		4,081,780		$	16.58		6.11	$	29,135,028

Black-Scholes Option-Pricing Model [Member]

Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions


	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Expected life (years)		5.6			5.6
Interest rate		2.7	%		1.9	%
Volatility		26.4	%		29.4	%
Dividend yield		—			—

LTIP Performance Shares [Member]

Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of March 31, 2018 and changes during the period are as follows:


Nonvested LTIP Performance Shares	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		1,125,035		$	18.94
Forfeited		(8,008	)		19.57

Nonvested as of March 31, 2018		1,117,027		$	18.94

Total Shareholder Return [Member] | Monte Carlo Simulation [Member]

Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions

The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:


	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Expected life (years)		2.9			2.9
Interest rate		2.4	%		1.5	%
Volatility		28.0	%		26.5	%
Dividend Yield		—			—

TSR Plan [Member]

Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested TSRs outstanding as of March 31, 2018 and changes during the period are as follows:


Nonvested Total Shareholder Return Awards	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		143,649		$	24.37
Granted		541,214			31.31
Forfeited		(1,837	)		31.31

Nonvested as of March 31, 2018		683,026		$	29.85

Restricted Share Awards (RSAs) [Member]

Summary of Nonvested Restricted Share and Changes During Period

A summary of nonvested restricted share awards (“RSAs”) as of March 31, 2018 and changes during the period are as follows:


Nonvested Restricted Share Awards	Number of Restricted Share Awards			Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2017		503,237		$	20.63
Vested		(123,427	)		20.12
Forfeited		(10,727	)		20.12

Nonvested as of March 31, 2018		369,083		$	20.81

Performance-Based Restricted Share Awards [Member]

Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested Performance-Based Restricted Share Awards (“PBRSAs”) as of March 31, 2018 and changes during the period are as follows:


Nonvested Performance-Based Restricted Share Awards	Number of Performance-Based Restricted Share Awards		Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2017		173,636	$	24.41

Nonvested as of March 31, 2018		173,636	$	24.41

Restricted Share Units [Member]

Summary of Nonvested Restricted Share and Changes During Period

A summary of nonvested RSUs as of March 31, 2018 and changes during the period are as follows:


Nonvested Restricted Share Units	Number of Restricted Share Units			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2017		—		$	—
Granted		581,945			23.36
Forfeited		(2,461	)		23.36

Nonvested as of March 31, 2018		579,484		$	23.36

Software and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount and Accumulated Amortization of Other Intangible Assets

The carrying amount and accumulated amortization of the Company’s other intangible assets that were subject to amortization at each balance sheet date are as follows:


(in thousands)	March 31, 2018							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Balance		Gross Carrying Amount		Accumulated Amortization			Net Balance
Customer relationships	$	308,489	$	(122,164	)	$	186,325	$	305,218	$	(116,677	)	$	188,541
Trademarks and tradenames		16,842		(14,479	)		2,363		16,646		(13,906	)		2,740

	$	325,331	$	(136,643	)	$	188,688	$	321,864	$	(130,583	)	$	191,281

Estimated Amortization Expense for Future Fiscal Years Based on Capitalized Software and Other Intangible Assets

Based on capitalized software and other intangible assets at March 31, 2018, estimated amortization expense for future fiscal years is as follows:


Fiscal Year Ending December 31,	Software Amortization		Other Intangible Assets Amortization
(in thousands)
Remainder of 2018	$	38,406	$	14,410
2019		42,955		18,777
2020		33,127		17,866
2021		20,461		17,342
2022		8,780		17,184
2023		4,640		16,854
Thereafter		2,284		86,255

Total	$	150,653	$	188,688

Corporate Restructuring and Other Organizational Changes (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Components of Corporate Restructuring and Other Reorganization Activities from Recent Acquisitions

The components of corporate restructuring and other reorganization activities are included in the following table:


(in thousands)	Facility Closures
Balance, December 31, 2017	$	5,945
Amounts paid during the period		(455	)
Foreign currency translation		79

Balance, March 31, 2018	$	5,569

Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Average Share Amounts used to Compute Both Basic and Diluted Earnings (Loss) Per Share

The following table reconciles the average share amounts used to compute both basic and diluted loss per share (in thousands):


	Three Months Ended March 31,
	2018		2017
Weighted average shares outstanding:
Basic weighted average shares outstanding		115,642		116,610
Add: Dilutive effect of stock options		—		—

Diluted weighted average shares outstanding		115,642		116,610

Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Selected Segment Financial Data, Revenues, Operating Income (Loss) and Income (Loss) Before Income Taxes

The following is selected financial data for the Company’s reportable segments (in thousands):


	Three Months Ended
	March 31, 2018			March 31, 2017
Revenue
ACI On Premise	$	105,030		$	131,908
ACI On Demand		104,280			99,554

Total revenue	$	209,310		$	231,462

Segment Adjusted EBITDA
ACI On Premise	$	38,898		$	68,395
ACI On Demand		(4,233	)		(7,007	)
Depreciation and amortization		(24,993	)		(25,638	)
Stock-based compensation		(6,362	)		(6,297	)
Corporate and unallocated expenses		(20,014	)		(25,830	)
Interest, net		(6,621	)		(10,054	)
Other, net		(55	)		649

Loss before income taxes	$	(23,380	)	$	(5,782	)

Depreciation and amortization
ACI On Premise	$	2,975		$	3,261
ACI On Demand		7,736			8,388
Corporate		14,282			13,989

Total depreciation and amortization	$	24,993		$	25,638

Selected Segment Financial Data, Revenues and Long lived Assets

The following is selected financial data for the Company’s geographical areas and revenues by geographic location and primary solution category for the periods indicated (in thousands):


	Three Months Ended March 31, 2018						Three Months Ended March 31, 2017
(in thousands)	ACI On Premise		ACI On Demand		Total		ACI On Premise		ACI On Demand		Total
Primary Geographic Markets
Americas - United States		30,864		88,946		119,810		49,193		85,809		135,002
Americas - Other		16,784		2,319		19,103		14,874		2,252		17,126
EMEA		38,686		12,009		50,695		51,904		11,079		62,983
Asia Pacific		18,696		1,006		19,702		15,937		414		16,351

Total	$	105,030	$	104,280	$	209,310	$	131,908	$	99,554	$	231,462

Primary Solution Categories
Bill Payments		—		66,168		66,168		—		65,246		65,246
Digital Channels/Online		11,363		10,644		22,007		12,488		10,491		22,979
Merchant Payments		5,010		12,371		17,381		6,312		11,359		17,671
Payments Risk Management		10,420		11,798		22,218		5,160		10,308		15,468
Real Time Payments		13,641		450		14,091		13,548		195		13,743
Retail Payments		64,596		2,849		67,445		94,400		1,955		96,355

Total	$	105,030	$	104,280	$	209,310	$	131,908	$	99,554	$	231,462

The following is selected financial data for the Company’s long-lived assets by geographic location for the periods indicated (in thousands):


(in thousands)	March 31, 2018		December 31, 2017
Long lived assets
United States	$	854,156	$	759,513
Other		719,610		613,556

	$	1,573,766	$	1,373,069

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Activity within Accumulated Other Comprehensive Loss

Activity within accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017, which consists of foreign currency translation adjustments, were as follows:


(in thousands)	Accumulated other comprehensive loss
Balance at December 31, 2017	$	(77,356	)
Other comprehensive income		5,659

Balance at March 31, 2018	$	(71,697	)


	Accumulated other comprehensive loss
Balance at December 31, 2016	$	(94,100	)
Other comprehensive income		6,051

Balance at March 31, 2017	$	(88,049	)

Condensed Consolidated Financial Statements - Components of Other Current Assets and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Current Assets and Liabilities [Line Items]
Other	$ 8,222	$ 5,781
Total other current assets	29,010	58,126
Settlement payables	20,245	48,953
Accrued interest	2,554	7,291
Vendor financed licenses	3,068	1,862
Royalties payable	9,883	9,264
Other	28,562	35,534
Total other current liabilities	64,312	102,904
Settlement deposits [Member]
Other Current Assets and Liabilities [Line Items]
Other assets settlement	8,905	22,282
Settlement receivables [Member]
Other Current Assets and Liabilities [Line Items]
Other assets settlement	$ 11,883	$ 30,063

Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds	$ 216,100	$ 238,900
Goodwill	909,691	909,691
Accounting Standards Update 2014-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect on retained earnings	244,000
ACI On Premise [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	725,900
ACI On Demand [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	183,800
Level 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Fair value senior note	$ 303,300	$ 305,700

Revenue - Additional Information (Detail) $ in Millions	3 Months Ended
Revenue - Additional Information (Detail) $ in Millions	Mar. 31, 2018 USD ($)
Revenue [Line Items]
Software licensing arrangements warranty, description	The Company's software license arrangements typically provide the customer with a standard 90-day assurance-type warranty.
Software licensing arrangements warranty period	90 days
Initial post contract customer support period	1 year
Percentage of receivables as of March 31, 2018 or December 31, 2017	No customer accounted for more than 10% of the Company's consolidated receivables balance as of March 31, 2018 or December 31, 2017.
Revenue allocated to remaining performance obligations	$ 589.5
Percentage of revenue allocated to remaining performance obligations to be recognized over the next 12 months	50.00%
Capitalized sales commissions minimum amortization period	1 year
Selling and Marketing [Member]
Revenue [Line Items]
Amortization of capitalized sales commissions	$ 2.3
Cost of Revenue [Member]
Revenue [Line Items]
Amortization of capitalized contract costs	1.2
Other Noncurrent Assets [Member]
Revenue [Line Items]
Capitalized sales commissions	19.1
Capitalized contract costs, noncurrent	12.0
Other Current Assets [Member]
Revenue [Line Items]
Capitalized sales commissions	0.4
Capitalized contract costs, current	$ 0.2

Revenue - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]
Billed Receivables	$ 175,066	$ 240,137
Allowance for doubtful accounts	(4,001)	(4,799)
Billed Receivables, net	171,065	235,338
Accrued receivables	328,546	27,507
Significant financing component	(34,109)
Total accrued receivables, net	294,437	27,507
Less current accrued receivables	117,276	27,507
Less current significant financing component	(9,972)
Total long-term accrued receivables, net	187,133
Total receivables, net	$ 465,502	$ 262,845

Revenue - Changes in Deferred Revenue (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Deferred Revenue Disclosure [Abstract]
Deferred Revenue, Beginning Balance	$ 145,344
Deferral of revenue	56,264
Recognition of deferred revenue	(44,589)
Deferred Revenue, Ending Balance	$ 157,019

Revenue - Financial Statement Effect of Applying ASC 606 (Balance Sheet) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Receivables, net of allowances	$ 278,369	$ 262,845
Recoverable income taxes	7,673	7,921
Prepaid expenses	29,961	23,219
Other current assets	29,010	58,126
Accrued receivables, net	187,133
Deferred income taxes, net	22,109	66,749
Other noncurrent assets	56,826	36,483
Liabilities
Deferred revenue	111,639	107,543
Income taxes payable	6,178	9,898
Other current liabilities	64,312	102,904
Deferred income taxes, net	26,564	16,910
Stockholders' equity
Total stockholders' equity	979,022	$ 764,597
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets
Receivables, net of allowances	205,165
Recoverable income taxes	6,538
Prepaid expenses	30,702
Other current assets	28,795
Deferred income taxes, net	65,503
Other noncurrent assets	38,945
Liabilities
Deferred revenue	128,304
Income taxes payable	6,268
Other current liabilities	64,546
Deferred income taxes, net	7,876
Stockholders' equity
Total stockholders' equity	745,288
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member]
Assets
Receivables, net of allowances	73,204
Recoverable income taxes	1,135
Prepaid expenses	(741)
Other current assets	215
Accrued receivables, net	187,133
Deferred income taxes, net	(43,394)
Other noncurrent assets	17,881
Liabilities
Deferred revenue	(16,665)
Income taxes payable	(90)
Other current liabilities	(234)
Deferred income taxes, net	18,688
Stockholders' equity
Total stockholders' equity	$ 233,734

Revenue - Financial Statement Effect of Applying ASC 606 (Income Statement) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Software as a service and platform as a service	$ 104,280	$ 99,447
License	28,046	59,381
Maintenance	56,659	54,471
Services	20,325	18,163
Operating expenses
Selling and marketing	31,893	27,137
Other income (expense)
Interest income	2,744	106
Other, net	(55)	649
Income tax provision
Income tax benefit	(3,952)	$ (4,174)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues
Software as a service and platform as a service	105,174
License	43,921
Maintenance	55,771
Services	20,029
Operating expenses
Selling and marketing	30,346
Other income (expense)
Interest income	179
Other, net	(784)
Income tax provision
Income tax benefit	(2,043)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member]
Revenues
Software as a service and platform as a service	(894)
License	(15,875)
Maintenance	888
Services	296
Operating expenses
Selling and marketing	1,547
Other income (expense)
Interest income	2,565
Other, net	729
Income tax provision
Income tax benefit	$ (1,909)

Debt - Additional Information (Detail) - USD ($)		3 Months Ended
Debt - Additional Information (Detail) - USD ($)	Feb. 24, 2017	Mar. 31, 2018	Mar. 31, 2017	Aug. 20, 2013
Debt Instrument [Line Items]
Proceeds from revolving credit facility		$ 48,000,000	$ 12,000,000
Proceeds from term portion of credit agreement			$ 415,000,000
Credit facility, interest rate description		The applicable margin for borrowings under the Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.25% to 1.25% with respect to base rate borrowings and between 1.25% and 2.25% with respect to LIBOR rate borrowings. Interest is due and payable monthly. The interest rate in effect at March 31, 2018 for the Credit Facility was 3.63%.
Credit facility, interest rate margin above federal fund rate		0.50%
Credit facility, interest rate margin above one-month LIBOR rate		1.00%
Credit facility, borrowing rate		3.63%
Credit Facility maturity date		Feb. 24, 2022
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unused borrowings		$ 500,000,000
Term Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount outstanding		389,100,000
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes amount outstanding		$ 300,000,000		$ 300,000,000
Issue price percentage of senior notes of the principal amount				100.00%
Percentage of interest rate on notes				6.375%
Maturity date of senior notes		Aug. 15, 2020
Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate		0.25%
Credit facility, interest rate margin above LIBOR rate		1.25%
Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate		1.25%
Credit facility, interest rate margin above LIBOR rate		2.25%
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity	$ 500,000,000
Credit facilities, maturity	5 years
Proceeds from revolving credit facility	$ 12,000,000
Credit Agreement [Member] \| Term Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity	$ 415,000,000
Credit facilities, maturity	5 years
Proceeds from term portion of credit agreement	$ 415,000,000
Parent Company and Domestic Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral		100.00%
Foreign Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral		65.00%

Debt - Maturities on Long-Term Debt Outstanding (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2018	$ 15,563
2019	31,125
2020	331,125
2021	41,500
2022	269,750
Total	$ 689,063

Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs	$ (9,823)	$ (10,521)
Total debt	679,240	685,729
Current portion of long-term debt	20,379	17,786
Less current portion of debt issuance costs	(2,965)	(2,964)
Total long-term debt	658,861	667,943
6.375% Senior Notes, due August 2020 [Member]
Debt Instrument [Line Items]
Total debt	300,000	300,000
Term Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	389,063	394,250
Current portion of long-term debt	$ 23,344	20,750
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt		$ 2,000

Debt - Carrying Value of Debt (Parenthetical) (Detail) - 6.375% Senior Notes, due August 2020 [Member]	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Percentage of interest rate on notes	6.375%
Maturity date of senior notes	Aug. 15, 2020

Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under ESPP	38,145	44,685
Incentive plan, weighted-average grant date fair value of stock options granted	$ 7.03	$ 6.24
Incentive plan, total intrinsic value of stock options exercised	$ 7,200,000	$ 4,600,000
Expected dividend yield	0.00%
Dividend paid	$ 0
Stock-based compensation expenses	$ 6,362,000	6,297,000
Stock-based compensation expenses tax benefits	$ 1,000,000	$ 2,200,000
Employee Stock Purchase Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance	3,000,000
Permitted designation for purchase of common stock under ESPP	Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation, for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter.
Employee participating annual base compensation designated for purchase of common stock, amount	$ 25,000
Employee participating annual base compensation designated for purchase of common stock, percent	10.00%
Price of common stock purchased under ESPP, percent	85.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 7,600,000
Unrecognized compensation costs, weighted-average recognition periods	1 year 2 months 12 days
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share awards, vesting increments on the anniversary dates of grants	33.00%
Awards granted requisite service period	3 years
Unrecognized compensation costs	$ 13,100,000
Unrecognized compensation costs, weighted-average recognition periods	2 years 10 months 24 days
Restricted Share Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation awards, shares vested	123,427
Shares withheld to pay employees' portion of minimum payroll withholding taxes	40,335
Unrecognized compensation costs	$ 5,500,000
Unrecognized compensation costs, weighted-average recognition periods	1 year 9 months 18 days
Performance-Based Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 300,000
Unrecognized compensation costs, weighted-average recognition periods	2 months 12 days
LTIP Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 9,800,000
Unrecognized compensation costs, weighted-average recognition periods	1 year 8 months 12 days
Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation awards, award payout range, minimum	0.00%
Stock based compensation awards, award payout range, maximum	200.00%
Unrecognized compensation costs	$ 18,500,000
Unrecognized compensation costs, weighted-average recognition periods	2 years 9 months 18 days

Stock-Based Compensation Plans - Summary of Stock Options Issued Pursuant to Stock Incentive Plans (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Number of Shares
Outstanding, Beginning Balance \| shares	6,162,717
Granted \| shares	170,455
Exercised \| shares	(656,898)
Forfeited \| shares	(3,255)
Outstanding, Ending Balance \| shares	5,673,019
Number of Shares Exercisable, Ending Balance \| shares	4,081,780
Weighted-Average Exercise Price
Beginning Balance \| $ / shares	$ 16.83
Granted \| $ / shares	23.36
Exercised \| $ / shares	13.88
Forfeited \| $ / shares	17.89
Ending Balance \| $ / shares	17.37
Weighted-Average Exercise Price Exercisable, Ending Balance \| $ / shares	$ 16.58
Weighted-Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period	6 years 8 months 26 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of end of period	6 years 1 month 9 days
Aggregate Intrinsic Value of In-the-Money Options
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period \| $	$ 36,025,874
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period \| $	$ 29,135,028

Stock-Based Compensation Plans - Estimated Fair Value of Options Granted using Black-Scholes Option-Pricing Model with Weighted-Average Assumptions (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Black-Scholes Option-Pricing Model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 7 months 6 days	5 years 7 months 6 days
Interest rate	2.70%	1.90%
Volatility	26.40%	29.40%
Dividend yield	0.00%	0.00%

Stock-Based Compensation Plans - Summary of Nonvested LTIP Performance Based Share Awards and Changes During Period (Detail) - LTIP Performance Shares [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of Shares at Expected Attainment
Beginning Balance \| shares	1,125,035
Forfeited \| shares	(8,008)
Ending Balance \| shares	1,117,027
Weighted-Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 18.94
Forfeited \| $ / shares	19.57
Ending Balance \| $ / shares	$ 18.94

Stock-Based Compensation Plans - Summary of Nonvested Restricted Share Awards and Changes During Period (Detail) - Restricted Share Awards (RSAs) [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Nonvested Restricted Share Awards
Beginning Balance \| shares	503,237
Vested \| shares	(123,427)
Forfeited \| shares	(10,727)
Ending Balance \| shares	369,083
Weighted-Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 20.63
Vested \| $ / shares	20.12
Forfeited \| $ / shares	20.12
Ending Balance \| $ / shares	$ 20.81

Stock-Based Compensation Plans - Summary of Nonvested Performance Based Share Awards and Changes During Period (Detail) - Performance-Based Restricted Share Awards [Member]	Mar. 31, 2018 $ / shares shares
Nonvested Restricted Share Awards
Beginning Balance \| shares	173,636
Ending Balance \| shares	173,636
Weighted-Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 24.41
Ending Balance \| $ / shares	$ 24.41

Stock-Based Compensation Plans - Estimated Fair Value of Options Granted Total Shareholder Return (TSRs) using Monte Carlo Simulation Model with Weighted-Average Assumptions (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Total Shareholder Return [Member] \| Monte Carlo Simulation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	2 years 10 months 24 days	2 years 10 months 24 days
Interest rate	2.40%	1.50%
Volatility	28.00%	26.50%
Dividend yield	0.00%	0.00%

Stock-Based Compensation Plans - Summary of Nonvested Total Shareholder Return (TSRs) Outstanding and Changes During Period (Detail) - Total Shareholder Return [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of Shares at Expected Attainment
Beginning Balance \| shares	143,649
Granted \| shares	541,214
Forfeited \| shares	(1,837)
Ending Balance \| shares	683,026
Weighted-Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 24.37
Granted \| $ / shares	31.31
Forfeited \| $ / shares	31.31
Ending Balance \| $ / shares	$ 29.85

Stock-Based Compensation Plans - Summary of Nonvested Restricted Share Unit and Changes During Period (Detail) - Restricted Share Units [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Nonvested Restricted Share Awards
Beginning Balance \| shares	0
Granted \| shares	581,945
Forfeited \| shares	(2,461)
Ending Balance \| shares	579,484
Weighted-Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 0.00
Granted \| $ / shares	23.36
Forfeited \| $ / shares	23.36
Ending Balance \| $ / shares	$ 23.36

Software and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 150,653		$ 155,386
Software, accumulated amortization	236,800		230,700
Other intangible assets amortization expense	4,900	$ 4,800
Software Marketed for External Sale [Member]
Finite-Lived Intangible Assets [Line Items]
Software, net	37,900		40,900
Software, amortization expense	$ 3,600	3,300
Software Marketed for External Sale [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Marketed for External Sale [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Software Acquired or Developed for Internal Use [Member]
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 112,800		$ 114,500
Software, amortization expense	$ 10,500	$ 11,300
Software Acquired or Developed for Internal Use [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Acquired or Developed for Internal Use [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years

Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 325,331	$ 321,864
Accumulated Amortization	(136,643)	(130,583)
Net Balance	188,688	191,281
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	308,489	305,218
Accumulated Amortization	(122,164)	(116,677)
Net Balance	186,325	188,541
Trademarks and Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,842	16,646
Accumulated Amortization	(14,479)	(13,906)
Net Balance	$ 2,363	$ 2,740

Software and Other Intangible Assets - Estimated Amortization Expense for Future Fiscal Years Based on Capitalized Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 188,688	$ 191,281
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	38,406
2019	42,955
2020	33,127
2021	20,461
2022	8,780
2023	4,640
Thereafter	2,284
Net Balance	150,653
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	14,410
2019	18,777
2020	17,866
2021	17,342
2022	17,184
2023	16,854
Thereafter	86,255
Net Balance	$ 188,688

Corporate Restructuring and Other Organizational Changes - Components of Corporate Restructuring and Other Reorganization Activities from Recent Acquisitions (Detail) - Facility Closures [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 5,945
Amounts paid during the period	(455)
Foreign currency translation	79
Ending balance	$ 5,569

Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) - Facility Closures [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,569	$ 5,945
Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,800
Other Noncurrent Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,800

Common Stock and Treasury Stock - Additional Information (Detail) - USD ($)	3 Months Ended	67 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Feb. 28, 2018
Stock authorized to purchase under stock repurchase program			$ 200,000,000
Repurchase of common stock, shares	1,346,427	43,129,393
Repurchase of common stock, value	$ 31,100,000	$ 524,400,000
Maximum [Member]
Remaining value of shares authorized for purchase under the stock repurchase program	$ 200,000,000	$ 200,000,000

Loss Per Share - Reconciliation of Average Share Amounts used to Compute Both Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted average shares outstanding:
Basic weighted average shares outstanding	115,642	116,610
Add: Dilutive effect of stock options	0	0
Diluted weighted average shares outstanding	115,642	116,610

Loss Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Earnings Per Share [Abstract]
Options to purchase shares, restricted share awards, and contingently issuable shares excluded from diluted net loss per share computation	8,600,000	10,500,000
Common stock outstanding	116,394,285		117,096,731

Other, net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Foreign currency transaction gains (losses)	$ (0.1)	$ 0.6

Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 209,310	$ 231,462
Stock-based compensation	(6,362)	(6,297)
Corporate and unallocated expenses	(20,014)	(25,830)
Interest, net	(6,621)	(10,054)
Other, net	(55)	649
Loss before income taxes	(23,380)	(5,782)
Depreciation and amortization expense	24,993	25,638
ACI On Premise [Member]
Segment Reporting Information [Line Items]
Revenues	105,030	131,908
ACI On Demand [Member]
Segment Reporting Information [Line Items]
Revenues	104,280	99,554
Operating Segments [Member] \| ACI On Premise [Member]
Segment Reporting Information [Line Items]
Revenues	105,030	131,908
Segment Adjusted EBITDA	38,898	68,395
Depreciation and amortization expense	2,975	3,261
Operating Segments [Member] \| ACI On Demand [Member]
Segment Reporting Information [Line Items]
Revenues	104,280	99,554
Segment Adjusted EBITDA	(4,233)	(7,007)
Depreciation and amortization expense	7,736	8,388
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	$ 14,282	$ 13,989

Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 209,310	$ 231,462
Long lived assets
Long lived assets	1,573,766		$ 1,373,069
Bill Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	66,168	65,246
Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22,007	22,979
Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17,381	17,671
Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22,218	15,468
Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,091	13,743
Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	67,445	96,355
ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	105,030	131,908
ACI On Premise [Member] \| Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	11,363	12,488
ACI On Premise [Member] \| Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,010	6,312
ACI On Premise [Member] \| Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	10,420	5,160
ACI On Premise [Member] \| Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	13,641	13,548
ACI On Premise [Member] \| Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	64,596	94,400
ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	104,280	99,554
ACI On Demand [Member] \| Bill Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	66,168	65,246
ACI On Demand [Member] \| Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	10,644	10,491
ACI On Demand [Member] \| Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,371	11,359
ACI On Demand [Member] \| Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	11,798	10,308
ACI On Demand [Member] \| Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	450	195
ACI On Demand [Member] \| Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,849	1,955
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	119,810	135,002
Long lived assets
Long lived assets	854,156		759,513
United States [Member] \| ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	30,864	49,193
United States [Member] \| ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	88,946	85,809
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	19,103	17,126
Long lived assets
Long lived assets	719,610		$ 613,556
Other [Member] \| ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,784	14,874
Other [Member] \| ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,319	2,252
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	50,695	62,983
EMEA [Member] \| ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	38,686	51,904
EMEA [Member] \| ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,009	11,079
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	19,702	16,351
Asia Pacific [Member] \| ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,696	15,937
Asia Pacific [Member] \| ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,006	$ 414

Segment Information - Additional Information (Detail)	3 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2018
Geographic Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of revenues during the years ended March 31, 2018, and 2017	No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2018 and 2017.
Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of revenues during the years ended March 31, 2018, and 2017	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2018 and 2017.

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provisional tax expense recognized			$ 35.9
Adjustment to estimate related to executive compensation, tax benefit	$ 1.7
Tax expense for current impact of GILTI provisions	$ 1.3
Effective tax rate, percentage	17.00%	72.00%
Earnings (losses) of foreign entities	$ (1.8)	$ 8.7
Unrecognized tax benefit for uncertain tax positions	27.5		27.2
Accrued interest and penalties related to income tax liabilities	1.2		$ 1.2
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits	$ 0.1

Accumulated Other Comprehensive Loss - Activity within Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 764,597
Other comprehensive income	5,659	$ 6,051
Ending balance	979,022
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(77,356)	(94,100)
Ending balance	$ (71,697)	$ (88,049)