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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,236,100 | $ 1,146,000
Used vehicles | 554,300 | 514,400
Service loaners | 209,100 | 184,900
Parts, accessories and other | 120,300 | 112,400
Net inventories | 2,119,800 | 1,957,700
Service Loaner Inventory (Directly Leased from Manufacturer) | $ 29,900 | $ 31,700

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