Inventories and Floor Plan Payables - Floor Plan Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Minimum
Floor Plan Payable
Floor plan payment due period	3 days	3 days	3 days
Maximum
Floor Plan Payable
Floor plan payment due period	10 days	10 days	10 days
Floor Plan Facility
Floor Plan Payable
Total commitment	$ 1,850,000	$ 1,700,000	$ 1,850,000
Less: borrowings	(1,414,696)	(1,042,099)	(1,371,145)
Less: FLAIR offset account	(147,654)	(223,899)	(145,047)
Additional borrowing capacity	287,650	434,002	333,808
Less: short-term payable for sold inventory	(91,299)	(61,520)	(41,577)
Less: purchase commitments	(31,551)	(22,991)	(27,420)
Unencumbered borrowing capacity	164,800	349,491	264,811
Line of Credit | Floor Plan Facility
Floor Plan Payable
Total commitment	70,000	70,000	70,000
Less: borrowings	(31,885)	(20,885)	(20,885)
Additional borrowing capacity	38,115	49,115	49,115
Letters of credit | Floor Plan Facility
Floor Plan Payable
Total commitment	30,000	30,000	30,000
Less: outstanding letters of credit	(12,300)	(11,371)	(12,300)
Additional letters of credit capacity	$ 17,700	$ 18,629	$ 17,700