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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |
Amount of off balance sheet settlement funds | $ 209,400 | $ 238,900
Goodwill | 909,691 | 909,691
Undiscounted Minimum Commitments Under Noncancelable operating leases | 78,000 |
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 | $ 300,900 | $ 305,700

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- Definition The balance of the settlement funds at period end. Settlement funds are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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