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Accounts Receivable, Net - Summary of Accounts Receivable, Net and Activity in Allowance for Credit Loss by Portfolio Segment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]    
Accounts Receivable, Net, beginning balance $ 92,695  
Allowance for credit loss, beginning balance 8,456  
Credit loss expense 10,723 $ 2,736
Write-offs, net of recoveries (6,249)  
Allowance for credit loss, ending balance 12,930  
Accounts Receivable, Net, ending balance 125,252  
Commercial Services (Driver Billed)    
Accounts Notes And Loans Receivable [Line Items]    
Accounts Receivable, Net, beginning balance 9,793  
Allowance for credit loss, beginning balance 5,272  
Credit loss expense 2,744  
Write-offs, net of recoveries (5,449)  
Allowance for credit loss, ending balance 2,567  
Accounts Receivable, Net, ending balance 7,926  
Commercial Services (All Other)    
Accounts Notes And Loans Receivable [Line Items]    
Accounts Receivable, Net, beginning balance 51,158  
Allowance for credit loss, beginning balance 1,406  
Credit loss expense 6,256  
Write-offs, net of recoveries (334)  
Allowance for credit loss, ending balance 7,328  
Accounts Receivable, Net, ending balance 48,934  
Government Solutions    
Accounts Notes And Loans Receivable [Line Items]    
Accounts Receivable, Net, beginning balance 31,744  
Allowance for credit loss, beginning balance 1,778  
Credit loss expense 1,723  
Write-offs, net of recoveries (466)  
Allowance for credit loss, ending balance 3,035  
Accounts Receivable, Net, ending balance $ 68,392