Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
New vehicles	$ 621,000	$ 449,300
Used vehicles	563,200	534,000
Service loaners	162,100	143,800
Parts, accessories and other	102,500	89,700
Net inventories	$ 1,448,800	$ 1,216,800