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Condensed Consolidated Financial Statements - Summary of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill, gross amount prior to period   $ 957,123
Goodwill, total impairment prior to period   (47,432)
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 909,691  
Goodwill from acquisitions 368,574  
Goodwill, end of period 1,278,265  
ACI On Demand    
Goodwill [Line Items]    
Goodwill, gross amount prior to period   183,783
Goodwill, total impairment prior to period   0
Goodwill [Roll Forward]    
Goodwill, beginning of period 183,783  
Goodwill from acquisitions 368,574  
Goodwill, end of period 552,357  
ACI On Premise    
Goodwill [Line Items]    
Goodwill, gross amount prior to period   773,340
Goodwill, total impairment prior to period   $ (47,432)
Goodwill [Roll Forward]    
Goodwill, beginning of period 725,908  
Goodwill from acquisitions 0  
Goodwill, end of period $ 725,908