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Accounts Receivable, Net - Summary of Concentration of Credit Risk (Details) - Sales Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage	10.00%		10.00%
Customer Concentration Risk | Government Solutions | City of New York Department of Transportation
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage	40.50%	12.40%	31.60%	10.40%
Customer Concentration Risk | Commercial Services | Hertz Corporation
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		19.60%	13.00%	19.00%
Customer Concentration Risk | Commercial Services | Avis Budget Group Inc
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		16.50%		13.10%
Customer Concentration Risk | Commercial Services | Enterprise Holdings Inc
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		13.50%		13.70%

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