Segments Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segments Information
Revenue	$ 1,027,273	$ 1,064,769
Intersegment Eliminations
Segments Information
Revenue	(5,512)	(10,812)
Good Sam Services and Plans
Segments Information
Revenue	47,208	46,966
Good Sam Services and Plans | Intersegment Eliminations
Segments Information
Revenue	(1,484)	(1,332)
New vehicles
Segments Information
Revenue	497,317	529,577
New vehicles | Intersegment Eliminations
Segments Information
Revenue	(1,079)	(1,172)
Used vehicles
Segments Information
Revenue	206,665	180,008
Used vehicles | Intersegment Eliminations
Segments Information
Revenue	(568)	(597)
Products, service and other
Segments Information
Revenue	172,623	204,876
Products, service and other | Intersegment Eliminations
Segments Information
Revenue	(389)	(5,322)
Finance and insurance, net
Segments Information
Revenue	92,456	91,891
Finance and insurance, net | Intersegment Eliminations
Segments Information
Revenue	(1,992)	(2,389)
Good Sam Club
Segments Information
Revenue	11,004	11,451
Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	48,692	48,298
Good Sam Services and Plans | Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	48,692	48,298
RV and Outdoor Retail
Segments Information
Revenue	980,065	1,017,803
RV and Outdoor Retail | Operating Segments
Segments Information
Revenue	984,093	1,027,283
RV and Outdoor Retail | New vehicles
Segments Information
Revenue	497,317	529,577
RV and Outdoor Retail | New vehicles | Operating Segments
Segments Information
Revenue	498,396	530,749
RV and Outdoor Retail | Used vehicles
Segments Information
Revenue	206,665	180,008
RV and Outdoor Retail | Used vehicles | Operating Segments
Segments Information
Revenue	207,233	180,605
RV and Outdoor Retail | Products, service and other
Segments Information
Revenue	172,623	204,876
RV and Outdoor Retail | Products, service and other | Operating Segments
Segments Information
Revenue	173,012	210,198
RV and Outdoor Retail | Finance and insurance, net
Segments Information
Revenue	92,456	91,891
RV and Outdoor Retail | Finance and insurance, net | Operating Segments
Segments Information
Revenue	94,448	94,280
RV and Outdoor Retail | Good Sam Club
Segments Information
Revenue	11,004	11,451
RV and Outdoor Retail | Good Sam Club | Operating Segments
Segments Information
Revenue	$ 11,004	$ 11,451