Commitments and Contingencies (Details) $ in Thousands		12 Months Ended
	Dec. 05, 2001 USD ($) subsidiary property item	Dec. 31, 2018 USD ($) location	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 28, 2014 property	Dec. 31, 2012 property	Dec. 28, 2012 property	Jan. 09, 2012 property	Dec. 29, 2011 property	Dec. 31, 2006 USD ($)
Future minimum annual fixed rentals under operating leases
2019		$ 118,379
2020		113,256
2021		108,988
2022		104,641
2023		101,524
Thereafter		830,179
Total		1,376,967
Rent expense		110,800	$ 86,500	$ 74,500
Letters of credit		14,000	12,200
Cost of real property purchased		$ 560,409	370,063
Initial term of lease		20 years
Number of renewal options | item	2
Renewal term of lease	5 years
Net book value of Land and buildings removed from balance sheet	$ 45,800
Annual net average lease payments	$ 3,400
Derecognition resulted in deferred gain		$ 500		100
Payments to acquire assets		254,359	80,771	56,943
FreedomRoads, LLC Floor Plan Facility
Future minimum annual fixed rentals under operating leases
Letters of credit		10,400	8,900
Property sold in 2018
Future minimum annual fixed rentals under operating leases
Gains (Losses) in sale leaseback arrangement		(100)
Cost of real property purchased		15,000
Payments to Acquire Real Estate		15,100
Original purchase price		$ 15,100
Property sold in 2017
Future minimum annual fixed rentals under operating leases
Cost of real property purchased			6,000
Payments to Acquire Real Estate			6,000
Original purchase price			6,000
Property sold in 2016
Future minimum annual fixed rentals under operating leases
Cost of real property purchased				13,200
Payments to Acquire Real Estate				11,900	$ 1,200	$ 100
Original purchase price				11,900	$ 1,200	$ 100
Minimum
Future minimum annual fixed rentals under operating leases
Initial term of lease	25 years	13 years
Maximum
Future minimum annual fixed rentals under operating leases
Initial term of lease	27 years	20 years
Other agreements
Period for severance pay beyond termination date		1 year
Sponsorship agreements
Future minimum annual fixed rentals under operating leases
2019		$ 10,200
2020		9,200
2021		9,500
2022		9,900
2023		1,500
2024		1,500
Subscription agreement
Other agreements
2014		1,700
2015		1,600
2016		1,800
2017		2,100
2018		2,200
Total		9,400
Amended Subscription Agreement
Other agreements
2017		4,000
2018		4,300
2019		4,500
2020		4,800
2021		5,000
Third Party
Future minimum annual fixed rentals under operating leases
2019		116,131
2020		111,008
2021		106,740
2022		102,496
2023		99,594
Thereafter		811,228
Total		1,347,197
Related Party
Future minimum annual fixed rentals under operating leases
2019		2,248
2020		2,248
2021		2,248
2022		2,145
2023		1,930
Thereafter		18,951
Total		29,770
Subsidiary of FreedomRoads
Future minimum annual fixed rentals under operating leases
Gains (Losses) in sale leaseback arrangement				100
Initial term of lease												20 years
Derecognition resulted in deferred gain												$ 6,400
Income recognition (offset to rent expense) of the deferred credits		300	300	$ 300
Subsidiary of FreedomRoads | Property sold in 2018
Future minimum annual fixed rentals under operating leases
Cost of real property purchased		45,800
Payments to Acquire Real Estate		46,100
Original purchase price		46,100
Subsidiary of FreedomRoads | Maximum
Future minimum annual fixed rentals under operating leases
Gains (Losses) in sale leaseback arrangement		(100)	(100)
AGRP Holding Corp
Future minimum annual fixed rentals under operating leases
Number of real estate properties sold | property							2	2	1	1	6
Number of real estate properties owned | property											11
Number of separate wholly owned subsidiaries of related party | subsidiary	11
Derecognition resulted in deferred gain		4,100	$ 4,600
GSE
Future minimum annual fixed rentals under operating leases
Number of real estate properties sold | property	11
Consideration received	$ 52,300
Gain from sale of land and building	6,100
Gain on certain properties	12,100
Loss on other properties	$ 6,000
RV Dealership Groups
Future minimum annual fixed rentals under operating leases
Payments to Acquire Real Estate		46,000
Original purchase price		$ 46,000
Number of locations acquired | location		10
Payments to acquire assets		$ 92,100
RV Dealership Groups | FreedomRoads, LLC Floor Plan Facility
Future minimum annual fixed rentals under operating leases
Borrowing to purchase of business		$ 38,700