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Commitments and Contingencies - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Other Commitments [Line Items] |  |
Lease exit costs accrual | $ 0 | $ 4,634,000
Maximum exposure associated with general indemnifications | $ 24,200,000 | $ 13,200,000
General indemnifications minimum expiration period | 1 year |
General indemnifications maximum expiration period | 3 years |
Percentage of dealership that is accounted for under the equity method | 50.00% | 50.00%
Contingent liability reserve balance after reduction | $ 4,300,000 | $ 4,300,000
Acquired business, earnings targets, maximum term | 10 years |
Maximum aggregate earnout payment | $ 80,000,000.0 |
Earnout accrual recorded in other long-term liabilities | 15,600,000 |
Earnout accrual | 7,800,000 |
Earnout accrual recorded in other accrued liabilities | 7,800,000 |
Other accrued liabilities |  |
Other Commitments [Line Items] |  |
Amount reserved for pending proceedings | 1,400,000 | 2,100,000
Other long-term liabilities |  |
Other Commitments [Line Items] |  |
Amount reserved for pending proceedings | $ 300,000 | $ 300,000

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