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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amount of off balance sheet settlement funds | $ 256,500,000 |  | $ 238,900,000
Goodwill measurement period | 1 year |  |
Cumulative effect on retained earnings | $ 243,981,000 | $ (99,000) |
Undiscounted minimum commitments under noncancelable operating leases | 77,578,000 |  |
Goodwill | 909,691,000 |  | $ 909,691,000
ACI On Premise [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | 725,900,000 |  |
ACI On Demand [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | $ 183,800,000 |  |
Minimum [Member] | Internal-Use Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 3 years |  |
Maximum [Member] | Internal-Use Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 10 years |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cumulative effect on retained earnings | $ 244,000,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Undiscounted minimum commitments under noncancelable operating leases | $ 77,600,000 |  |
Expected operating lease liability and ROU asset ranges, description | Based on currently available information, the Company expects to recognize operating lease liabilities and ROU assets of $65 million – $75 million and $60 million – $70 million, respectively |  |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected operating lease liability | $ 65,000,000 |  |
Expected right-of-use asset (ROU) | 60,000,000 |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected operating lease liability | 75,000,000 |  |
Expected right-of-use asset (ROU) | $ 70,000,000 |  |
Other Intangible Assets [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 3 years |  |
Other Intangible Assets [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 20 years |  |
Level 2 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Stated interest rate of Senior Notes | 5.75% |  | 6.375%
Level 2 [Member] | Senior Notes [Member] | 5.750% Senior Notes due 2026 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value of long-term debt | $ 395,000,000 |  |
Level 2 [Member] | Senior Notes [Member] | 6.375% Senior Note due 2020 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value of long-term debt |  |  | $ 305,700,000

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