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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 |

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