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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amount of off balance sheet settlement funds | $ 199,600 |  | $ 256,500
Goodwill | 909,691 |  | 909,691
Operating Lease Liability | 64,970 |  |
Right-of-use Asset (ROU) | 60,978 |  |
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 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating Lease Liability |  | $ 63,300 |
Right-of-use Asset (ROU) |  | $ 68,600 |
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 | $ 409,500 |  | $ 395,000
State interest rate | 5.75% |  |

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