Commitments and Contingencies (Details) $ in Thousands		12 Months Ended
	Dec. 05, 2001 USD ($) subsidiary property item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2006 USD ($)	Feb. 28, 2014 property	Dec. 31, 2012 property	Dec. 28, 2012 property	Jan. 09, 2012 property	Dec. 29, 2011 property
Future minimum annual fixed rentals under operating leases
2018		$ 101,271
2019		98,374
2020		91,460
2021		87,771
2022		83,844
Thereafter		712,155
Total		1,174,875
Rent expense		86,500	$ 74,500	$ 61,500
Letters of credit		12,200	10,800
Cost of real property purchased		$ 359,836	273,541
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		$ 100		4,600
FreedomRoads, LLC Floor Plan Facility
Future minimum annual fixed rentals under operating leases
Letters of credit		8,900	7,600
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
Property sold in 2015
Future minimum annual fixed rentals under operating leases
Cost of real property purchased				19,000
Payments to Acquire Real Estate				18,100	900
Original purchase price				18,100	$ 900
Minimum
Future minimum annual fixed rentals under operating leases
Initial term of lease	25 years
Maximum
Future minimum annual fixed rentals under operating leases
Initial term of lease	27 years
Other agreements
Period for severance pay beyond termination date		1 year
Sponsorship agreements
Future minimum annual fixed rentals under operating leases
2018		$ 9,800
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
2018		99,145
2019		96,248
2020		89,334
2021		85,644
2022		81,820
Thereafter		691,385
Total		1,143,576
Related Party
Future minimum annual fixed rentals under operating leases
2018		2,126
2019		2,126
2020		2,126
2021		2,127
2022		2,024
Thereafter		20,770
Total		31,299
Subsidiary of FreedomRoads
Future minimum annual fixed rentals under operating leases
Gains (Losses) in sale leaseback arrangement			100	400
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 | FreedomRoads, LLC Floor Plan Facility
Future minimum annual fixed rentals under operating leases
Letters of credit		400
Subsidiary of FreedomRoads | Maximum
Future minimum annual fixed rentals under operating leases
Gains (Losses) in sale leaseback arrangement		(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		$ 4,600	$ 5,100
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