Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segments Information
Revenue	$ 1,855,682	$ 1,916,574	$ 5,686,710	$ 5,536,162
Intersegment Eliminations
Segments Information
Revenue	(7,561)	(7,090)	(24,265)	(21,918)
Good Sam Services and Plans
Segments Information
Revenue	50,352	46,581	144,504	134,354
Good Sam Services and Plans | Intersegment Eliminations
Segments Information
Revenue	(61)	(51)	(410)	(145)
New vehicles
Segments Information
Revenue	834,112	864,303	2,746,323	2,745,057
New vehicles | Intersegment Eliminations
Segments Information
Revenue	(1,484)	(1,583)	(5,068)	(5,586)
Used vehicles
Segments Information
Revenue	525,988	519,550	1,484,978	1,273,944
Used vehicles | Intersegment Eliminations
Segments Information
Revenue	(1,090)	(1,015)	(3,100)	(2,867)
Products, service and other
Segments Information
Revenue	268,940	305,882	761,914	862,706
Products, service and other | Intersegment Eliminations
Segments Information
Revenue	(237)	(359)	(810)	(1,252)
Finance and insurance, net
Segments Information
Revenue	165,136	167,779	513,921	483,718
Finance and insurance, net | Intersegment Eliminations
Segments Information
Revenue	(4,689)	(4,082)	(14,877)	(12,068)
Good Sam Club
Segments Information
Revenue	11,154	12,479	35,070	36,383
Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	50,413	46,632	144,914	134,499
Good Sam Services and Plans | Good Sam Services and Plans | Operating Segments
Segments Information
Revenue	50,413	46,632	144,914	134,499
RV and Outdoor Retail
Segments Information
Revenue	1,805,330	1,869,993	5,542,206	5,401,808
RV and Outdoor Retail | Operating Segments
Segments Information
Revenue	1,812,830	1,877,032	5,566,061	5,423,581
RV and Outdoor Retail | New vehicles
Segments Information
Revenue	834,112	864,303	2,746,323	2,745,057
RV and Outdoor Retail | New vehicles | Operating Segments
Segments Information
Revenue	835,596	865,886	2,751,391	2,750,643
RV and Outdoor Retail | Used vehicles
Segments Information
Revenue	525,988	519,550	1,484,978	1,273,944
RV and Outdoor Retail | Used vehicles | Operating Segments
Segments Information
Revenue	527,078	520,565	1,488,078	1,276,811
RV and Outdoor Retail | Products, service and other
Segments Information
Revenue	268,940	305,882	761,914	862,706
RV and Outdoor Retail | Products, service and other | Operating Segments
Segments Information
Revenue	269,177	306,241	762,724	863,958
RV and Outdoor Retail | Finance and insurance, net
Segments Information
Revenue	165,136	167,779	513,921	483,718
RV and Outdoor Retail | Finance and insurance, net | Operating Segments
Segments Information
Revenue	169,825	171,861	528,798	495,786
RV and Outdoor Retail | Good Sam Club
Segments Information
Revenue	11,154	12,479	35,070	36,383
RV and Outdoor Retail | Good Sam Club | Operating Segments
Segments Information
Revenue	$ 11,154	$ 12,479	$ 35,070	$ 36,383