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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Balance $ 586,435 $ 584,150
Foreign currency translation adjustment (2,168) 2,285
Balance 838,867 586,435
Redflex    
Goodwill [Line Items]    
Goodwill from Acquisition 56,214  
T2 Systems    
Goodwill [Line Items]    
Goodwill from Acquisition 195,226  
NuPark    
Goodwill [Line Items]    
Goodwill from Acquisition 3,160  
Commercial Services    
Goodwill [Line Items]    
Balance 426,689 424,404
Foreign currency translation adjustment (1,608) 2,285
Balance 425,081 426,689
Government Solutions    
Goodwill [Line Items]    
Balance 159,746 159,746
Foreign currency translation adjustment (560)  
Balance 215,400 $ 159,746
Government Solutions | Redflex    
Goodwill [Line Items]    
Goodwill from Acquisition 56,214  
Parking Solutions    
Goodwill [Line Items]    
Balance 198,386  
Parking Solutions | T2 Systems    
Goodwill [Line Items]    
Goodwill from Acquisition 195,226  
Parking Solutions | NuPark    
Goodwill [Line Items]    
Goodwill from Acquisition $ 3,160