Acquisitions - Purchase Price (Details) - USD ($) $ in Thousands		6 Months Ended
May 26, 2017	Jun. 30, 2017	Jun. 30, 2016
Assets Or Stock Of Multiple Dealership Locations Acquired
Acquisitions
Purchase Price		$ 216,611	$ 60,251
Inventory purchases financed via floor plan		(71,124)	(22,265)
Cash payment net of holdback and floor plan financing		$ 145,487	$ 37,986
Gander Mountain and Overton's
Acquisitions
Purchase Price	$ 36,474
Contingent consideration	1,000
Cash paid for acquisition	35,449
Goodwill for tax purposes	$ 4,700

The amount of cash payment net of holdback and floor plan financing related to a business acquisition.

No definition available.

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- Definition

Amount of inventory purchases financed through floor plan related to business acquisition.

+ References

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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