Significant Accounting Policies - Summary of Activity in Allowance for Credit Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Balance		$ 12,138	$ 11,471
Credit loss expense		3,505	2,402
Write-offs, net of recoveries		(1,344)	(1,741)
Balance		14,299	12,132
Parking Solutions
Accounts Notes And Loans Receivable [Line Items]
Balance		0
Credit loss expense		159
Write-offs, net of recoveries		(108)
Balance		51
Commercial Services (Driver Billed)
Accounts Notes And Loans Receivable [Line Items]
Balance	[1]	5,397	3,210
Credit loss expense	[1]	2,868	2,252
Write-offs, net of recoveries	[1]	(1,221)	(1,722)
Balance	[1]	7,044	3,740
Commercial Services (All Other)
Accounts Notes And Loans Receivable [Line Items]
Balance		3,092	4,277
Credit loss expense		246	143
Write-offs, net of recoveries		(15)	(2)
Balance		3,323	4,422
Government Solutions
Accounts Notes And Loans Receivable [Line Items]
Balance		3,649	3,984
Credit loss expense		232	7
Write-offs, net of recoveries		0	(21)
Balance		$ 3,881	$ 3,970

[1] Driver-billed consists of receivables from drivers of rental cars and fleet management companies for which the Company bills on behalf of its customers. Receivables not collected from drivers within a defined number of days are transferred to customers subject to applicable bad debt sharing agreements.