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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,072,318 | $ 983,123
Used vehicles | 324,526 | 319,791
Service loaners | 152,254 | 152,278
Parts, accessories and other | 59,120 | 62,683
Net inventories | $ 1,608,218 | $ 1,517,875

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