Segment Information - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segments Information
Revenue	$ 6,913,754	$ 5,446,591	$ 4,892,019
Intersegment Eliminations
Segments Information
Revenue	(26,466)	(21,594)	(21,143)
Good Sam Services and Plans
Segments Information
Revenue	180,722	180,977	179,538
Good Sam Services and Plans | Intersegment Eliminations
Segments Information
Revenue	(204)	(1,781)	(1,988)
New vehicles
Segments Information
Revenue	3,299,454	2,823,311	2,370,321
New vehicles | Intersegment Eliminations
Segments Information
Revenue	(6,548)	(5,985)	(5,156)
Used vehicles
Segments Information
Revenue	1,686,217	984,853	857,628
Used vehicles | Intersegment Eliminations
Segments Information
Revenue	(3,638)	(2,536)	(2,404)
Products, service and other
Segments Information
Revenue	1,100,942	948,890	1,034,577
Products, service and other | Intersegment Eliminations
Segments Information
Revenue	(1,465)	(1,357)	(1,862)
Finance and insurance, net
Segments Information
Revenue	598,475	464,261	401,302
Finance and insurance, net | Intersegment Eliminations
Segments Information
Revenue	(14,611)	(9,935)	(9,733)
Good Sam Club
Segments Information
Revenue	47,944	44,299	48,653
Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	180,926	182,758	181,526
Good Sam Services and Plans | Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	180,926	182,758	181,526
RV and Outdoor Retail
Segments Information
Revenue	6,733,032	5,265,614	4,712,481
RV and Outdoor Retail | Operating Segments
Segments Information
Revenue	6,759,294	5,285,427	4,731,636
RV and Outdoor Retail | New vehicles
Segments Information
Revenue	3,299,454	2,823,311	2,370,321
RV and Outdoor Retail | New vehicles | Operating Segments
Segments Information
Revenue	3,306,002	2,829,296	2,375,477
RV and Outdoor Retail | Used vehicles
Segments Information
Revenue	1,686,217	984,853	857,628
RV and Outdoor Retail | Used vehicles | Operating Segments
Segments Information
Revenue	1,689,855	987,389	860,032
RV and Outdoor Retail | Products, service and other
Segments Information
Revenue	1,100,942	948,890	1,034,577
RV and Outdoor Retail | Products, service and other | Operating Segments
Segments Information
Revenue	1,102,407	950,247	1,036,439
RV and Outdoor Retail | Finance and insurance, net
Segments Information
Revenue	598,475	464,261	401,302
RV and Outdoor Retail | Finance and insurance, net | Operating Segments
Segments Information
Revenue	613,086	474,196	411,035
RV and Outdoor Retail | Good Sam Club
Segments Information
Revenue	47,944	44,299	48,653
RV and Outdoor Retail | Good Sam Club | Operating Segments
Segments Information
Revenue	$ 47,944	$ 44,299	$ 48,653