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Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,027,727 | $ 1,017,523
Used vehicles | 293,179 | 294,496
Service loaners | 141,542 | 130,406
Parts, accessories and other | 66,013 | 70,320
Net inventories | $ 1,528,461 | $ 1,512,745

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