Segment Information - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Segment	Jun. 30, 2025 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| Segment			3
Impairment charges	$ 0	$ (172,400)	$ (400)	$ (173,800)
Segment Reporting [Line Items]
Revenues	3,934,000	3,657,200	7,622,500	7,308,500
Retail New Vehicles [Member]
Segment Reporting [Line Items]
Revenues	1,769,300	1,666,100	3,376,800	3,322,400
Fleet New Vehicles [Member]
Segment Reporting [Line Items]
Revenues	24,800	29,400	45,400	51,500
New vehicles
Segment Reporting [Line Items]
Revenues	1,794,100	1,695,500	3,422,200	3,373,900
Used vehicles
Segment Reporting [Line Items]
Revenues	1,329,700	1,180,700	2,599,300	2,405,700
Wholesale vehicles
Segment Reporting [Line Items]
Revenues	70,500	83,300	142,100	166,100
Total vehicles
Segment Reporting [Line Items]
Revenues	3,194,300	2,959,500	6,163,600	5,945,700
Parts, service and collision repair
Segment Reporting [Line Items]
Revenues	530,200	495,600	1,046,900	970,000
Finance, insurance and other, net
Segment Reporting [Line Items]
Revenues	$ 209,500	$ 202,100	$ 412,000	$ 392,800