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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,133,400 | $ 799,600
Used vehicles | 498,100 | 505,700
Service loaners | 178,600 | 172,700
Parts, accessories and other | 108,700 | 100,300
Net inventories | 1,918,800 | 1,578,300
Service Loaner Inventory (Directly Leased from Manufacturer) | $ 30,300 | $ 22,700

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