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Significant Accounting Policies - Summary of Concentration of Credit Risk (Details) - Sales Revenue - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Government Solutions | City of New York Department of Transportation
Concentration Risk [Line Items]
Concentration risk percentage	26.60%	31.30%	14.60%
Commercial Services | Hertz Corporation
Concentration Risk [Line Items]
Concentration risk percentage	12.60%	12.00%	18.70%
Commercial Services | Avis Budget Group, Inc.
Concentration Risk [Line Items]
Concentration risk percentage	12.30%	9.50%	14.50%
Commercial Services | Enterprise Holdings, Inc.
Concentration Risk [Line Items]
Concentration risk percentage	11.40%	11.30%	13.50%

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