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Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 578,322 $ 473,300
Less: Allowance for doubtful accounts (7,386) (5,281)
Less: Long-term portion of accounts receivable, net (48,998) (50,305)
Total accounts receivable, net $ 521,938 417,714
Threshold period for interest to bear on receivables 60 days  
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 286,578 233,506
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 45,895 45,193
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 60,022 43,937
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 96,141 76,948
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 75,052 69,859
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 14,634 $ 3,857
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Period that contracts in transit are outstanding 5 days  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Period that contracts in transit are outstanding 10 days