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Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Estimated credit loss expense includes specific provision		$ 10,723	$ 2,736
Sales Revenue
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage	10.00%	10.00%
Sales Revenue | Minimum | Customer Concentration Risk
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		10.00%
Accounts Receivable | Customer Concentration Risk | City of New York Department of Transportation
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		42.20%
Accounts Receivable | Minimum | Customer Concentration Risk
Accounts Notes And Loans Receivable [Line Items]
Concentration risk percentage		10.00%
One Customer of Commercial Services (All Other)
Accounts Notes And Loans Receivable [Line Items]
Estimated credit loss expense includes specific provision		$ 3,500

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