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Acquisitions - Assets (Liabilities) Acquired (Assumed) at Fair Value (Details) - USD ($) $ in Thousands			9 Months Ended
	Aug. 17, 2017	May 26, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 22, 2017	Dec. 31, 2016
Assets (liabilities) acquired (assumed) at fair value:
Goodwill			$ 328,402			$ 153,105
Trademarks and trade names
Assets (liabilities) acquired (assumed) at fair value:
Estimated life (in years)			15 years
Websites
Assets (liabilities) acquired (assumed) at fair value:
Estimated life (in years)			10 years
Assets Or Stock Of Multiple Dealership Locations Acquired
Assets (liabilities) acquired (assumed) at fair value:
Accounts receivable			$ 1,306	$ 944
Inventory			98,869	29,713
Property and equipment			835	635
Other assets			72	142
Accrued liabilities			(3,019)	(2,231)
Other liabilities				(75)
Total tangible net assets acquired			98,063	29,128
Intangible assets acquired			793	2,774
Goodwill			143,788	35,786
Purchase price			242,644	67,688
Assets Or Stock Of Multiple Dealership Locations Acquired \| Membership and customer lists
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired			$ 793	$ 2,774
Assets Or Stock Of Multiple Dealership Locations Acquired \| Membership and customer lists \| Minimum
Assets (liabilities) acquired (assumed) at fair value:
Estimated life (in years)			4 years	4 years
Assets Or Stock Of Multiple Dealership Locations Acquired \| Membership and customer lists \| Maximum
Assets (liabilities) acquired (assumed) at fair value:
Estimated life (in years)			7 years	7 years
Gander Mountain and Overton's
Assets (liabilities) acquired (assumed) at fair value:
Inventory		$ 9,965
Prepaid expenses and other assets		42
Property and equipment		8,436
Accrued liabilities		(373)
Total tangible net assets acquired		18,070
Intangible assets acquired		17,200
Goodwill		1,329
Purchase price		36,599
Contingent consideration unpaid at June 30, 2017		(1,021)
Gander Mountain and Overton's \| Trademarks and trade names
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired		$ 14,800
Estimated life (in years)		15 years
Gander Mountain and Overton's \| Membership and customer lists
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired		$ 500
Estimated life (in years)		6 years
Gander Mountain and Overton's \| Websites
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired		$ 1,900
Estimated life (in years)		10 years
TheHouse.com
Assets (liabilities) acquired (assumed) at fair value:
Cash and cash equivalents	$ 501
Accounts receivable	159
Inventory	36,317
Prepaid expenses and other assets	1,120
Property and equipment	548
Accounts payable	(7,582)
Accrued liabilities	(827)
Deferred tax liabilities	(6,016)
Total tangible net assets acquired	24,220
Intangible assets acquired	18,129
Goodwill	28,683
Purchase price	71,032
TheHouse.com \| Trademarks and trade names
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired	$ 14,039
Estimated life (in years)	15 years
TheHouse.com \| Websites
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired	$ 4,090
Estimated life (in years)	10 years
W82
Assets (liabilities) acquired (assumed) at fair value:
Inventory					$ 847
Prepaid expenses and other assets					7
Property and equipment					546
Accrued liabilities					(790)
Total tangible net assets acquired					610
Goodwill					1,497
Purchase price					$ 2,107