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Nature of Business and Summary of Significant Accounting Policies - Summary of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Gross Balance, prior to beginning of period     $ 957,123
Total impairment prior to beginning of period     (47,432)
Goodwill [Roll Forward]      
Balance, beginning of period $ 1,280,525 $ 909,691  
Goodwill from acquisitions   370,834  
Goodwill from acquisitions, subsequent adjustment (299)    
Balance, end of period 1,280,226 1,280,525  
ACI On Demand      
Goodwill [Line Items]      
Gross Balance, prior to beginning of period     183,783
Total impairment prior to beginning of period     0
Goodwill [Roll Forward]      
Balance, beginning of period 554,617 183,783  
Goodwill from acquisitions   370,834  
Goodwill from acquisitions, subsequent adjustment (299)    
Balance, end of period 554,318 554,617  
ACI On Premise      
Goodwill [Line Items]      
Gross Balance, prior to beginning of period     773,340
Total impairment prior to beginning of period     $ (47,432)
Goodwill [Roll Forward]      
Balance, beginning of period 725,908 725,908  
Goodwill from acquisitions   0  
Goodwill from acquisitions, subsequent adjustment 0    
Balance, end of period $ 725,908 $ 725,908