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Condensed Consolidated Financial Statements - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Amount of off balance sheet settlement funds   $ 174,000 $ 246,800
Goodwill   1,280,226 1,280,226
ACI On Demand      
Condensed Financial Statements, Captions [Line Items]      
Goodwill   554,300  
ACI On Premise      
Condensed Financial Statements, Captions [Line Items]      
Goodwill   725,900  
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   $ 18,800 19,300
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   $ 424,000 $ 424,500