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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,173,900 | $ 799,600
Used vehicles | 490,500 | 505,700
Service loaners | 182,100 | 172,700
Parts, accessories and other | 105,800 | 100,300
Net inventories | 1,952,300 | 1,578,300
Service Loaner Inventory (Directly Leased from Manufacturer) | $ 32,000 | $ 22,700

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