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Condensed Consolidated Financial Statements - Additional Information (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Jul. 31, 2019
USD ($)
Sep. 30, 2021
USD ($)
reportingUnit
Dec. 31, 2020
USD ($)
Condensed Financial Statements, Captions [Line Items]      
Right-of-use assets   $ 49,438 $ 41,243
Amount of off balance sheet settlement funds   196,000 246,800
Goodwill   $ 1,280,226 1,280,226
Number of reporting units | reportingUnit   2  
India payment technology and services company      
Condensed Financial Statements, Captions [Line Items]      
Payments to acquire investment interest $ 18,300    
Percentage of voting interests acquired 30.00%    
Equity method investment, amount recorded   $ 19,000 19,300
ACI On Demand      
Condensed Financial Statements, Captions [Line Items]      
Goodwill   554,300  
ACI On Premise      
Condensed Financial Statements, Captions [Line Items]      
Goodwill   $ 725,900  
Level 2 | Senior Notes | 5.750% Senior Notes due 2026      
Condensed Financial Statements, Captions [Line Items]      
Stated interest rate (percentage)   5.75%  
Fair value of long-term debt   $ 420,000 $ 424,500
Corporate Headquarters      
Condensed Financial Statements, Captions [Line Items]      
Right-of-use assets   12,900  
Operating lease liability   $ 15,200