Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
New vehicles	$ 278,200	$ 273,100
Used vehicles	730,800	807,200
Service loaners	112,500	106,300
Parts, accessories and other	76,600	74,600
Net inventories	$ 1,198,100	$ 1,261,200