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Significant Accounting Policies - Summary of Concentration of Credit Risk (Details) - Sales Revenue - Customer Concentration Risk
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Government Solutions | City of New York Department of Transportation        
Concentration Risk [Line Items]        
Concentration risk percentage 20.50% 25.50% 19.50% 25.60%
Commercial Services | Hertz Corporation        
Concentration Risk [Line Items]        
Concentration risk percentage 12.60% 12.90% 11.80% 13.20%
Commercial Services | Avis Budget Group, Inc.        
Concentration Risk [Line Items]        
Concentration risk percentage 13.90% 13.50% 12.90% 12.80%
Commercial Services | Enterprise Holdings, Inc.        
Concentration Risk [Line Items]        
Concentration risk percentage 10.30% 10.90% 9.70% 12.40%