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Acquisitions - Additional Information (Details)
$ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Dec. 13, 2021
USD ($)
Dec. 07, 2021
USD ($)
Jun. 17, 2021
USD ($)
Unit
Jun. 17, 2021
AUD ($)
Unit
$ / shares
Dec. 31, 2021
USD ($)
Unit
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                
Number of reporting units | Unit         4      
Goodwill         $ 838,867   $ 586,435 $ 584,150
Redflex Holdings Limited                
Business Acquisition [Line Items]                
Number of reporting units | Unit     2 2        
Date of acquisition     Jun. 17, 2021 Jun. 17, 2021        
Deferred revenue     $ 6,276   8,048 $ 1,772    
Goodwill     $ 1,015   56,214 55,199    
Redflex Holdings Limited | Scheme Amendment                
Business Acquisition [Line Items]                
Purchase percentage of outstanding equity     100.00%          
Consideration payable per share | $ / shares       $ 0.96        
Consideration amount     $ 117,900 $ 152.5        
Transaction costs related to acquisition     $ 9,700          
Redflex Holdings Limited | Trademarks                
Business Acquisition [Line Items]                
Intangible assets         900 900    
Identifiable intangible assets useful life     5 years 5 years        
Redflex Holdings Limited | Customer Relationships                
Business Acquisition [Line Items]                
Intangible assets     $ 2,400   25,900 23,500    
Identifiable intangible assets useful life     10 years 10 years        
Redflex Holdings Limited | Developed Technology                
Business Acquisition [Line Items]                
Intangible assets         $ 18,200 $ 18,200    
Identifiable intangible assets useful life     8 years 8 months 12 days 8 years 8 months 12 days        
T2 Systems Acquisition                
Business Acquisition [Line Items]                
Date of acquisition   Dec. 07, 2021            
Deferred revenue   $ 21,253            
Goodwill   195,226            
T2 Systems Acquisition | T2 Merger Agreement                
Business Acquisition [Line Items]                
Transaction costs related to acquisition   2,700            
Purchase price   353,200            
T2 Systems Acquisition | Trademarks                
Business Acquisition [Line Items]                
Intangible assets   $ 3,200            
Identifiable intangible assets useful life   10 years            
T2 Systems Acquisition | Customer Relationships                
Business Acquisition [Line Items]                
Intangible assets   $ 164,300            
Identifiable intangible assets useful life   10 years            
T2 Systems Acquisition | Developed Technology                
Business Acquisition [Line Items]                
Intangible assets   $ 19,300            
Identifiable intangible assets useful life   6 years 1 month 6 days            
NuPark                
Business Acquisition [Line Items]                
Business combination cash consideration $ 5,000              
Date of acquisition Dec. 13, 2021              
Business combination, contingent consideration payable $ 1,500              
Intangible assets 300              
Goodwill 3,200              
Purchase price $ 7,000              
Identifiable intangible assets useful life 10 years              
NuPark | Customer Relationships                
Business Acquisition [Line Items]                
Intangible assets $ 4,900