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Significant Accounting Policies - Summary of Accounts Receivable, Net and Activity in Allowance for Credit Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, beginning balance $ 11,471 $ 8,456  
Credit loss expense (income) 9,588 14,391 $ 8,100
Write-offs, net of recoveries (8,921) (11,376)  
Allowance for credit losses, ending balance 12,138 11,471 8,456
Commercial Services (Driver Billed)      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, beginning balance 3,210 5,272  
Credit loss expense (income) 11,040 6,554  
Write-offs, net of recoveries (8,853) (8,616)  
Allowance for credit losses, ending balance 5,397 3,210 5,272
Commercial Services (All Other)      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, beginning balance 4,277 1,406  
Credit loss expense (income) (1,138) 4,945  
Write-offs, net of recoveries (47) (2,074)  
Allowance for credit losses, ending balance 3,092 4,277 1,406
Government Solutions      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, beginning balance 3,984 1,778  
Credit loss expense (income) (314) 2,892  
Write-offs, net of recoveries (21) (686)  
Allowance for credit losses, ending balance $ 3,649 $ 3,984 $ 1,778