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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