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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
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