Acquisitions - Assets (Liabilities) Acquired (Assumed) at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets (liabilities) acquired (assumed) at fair value:
Goodwill	$ 359,117	$ 348,387	$ 153,075
Cash paid for acquisition, net of cash acquired	$ 99,240	392,956	$ 78,606
Estimated life (in years)	12 years 3 months 18 days
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)	8 years 4 months 24 days
Assets Or Stock Of Multiple Dealership Locations Acquired
Assets (liabilities) acquired (assumed) at fair value:
Cash and cash equivalents	$ 2,648
Contracts in Transit	104
Accounts receivable, net	100	1,250
Inventory, net	43,067	121,808
Prepaid expenses and other assets	124
Property and equipment, net	532	1,450
Deferred tax asset, net	48
Other assets		164
Accounts payable	(64)	(569)
Accrued liabilities	(1,096)	(2,480)
Deferred revenues and gains	(168)
Total tangible net assets acquired	45,295	121,623
Intangible assets acquired	766	793
Goodwill	47,197	158,815
Purchase Price	93,258	281,231
Cash and cash equivalents acquired	(2,648)
Cash paid for acquisition, net of cash acquired	90,610	281,231
Inventory purchases financed via floor plan	(34,313)	(99,451)
Cash payment net of floor plan financing	56,297	181,780
Assets Or Stock Of Multiple Dealership Locations Acquired \| Membership and customer lists
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired	$ 766	$ 793
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
Outdoor Lifestyle Retail Businesses
Assets (liabilities) acquired (assumed) at fair value:
Cash and cash equivalents		$ 591
Accounts receivable, net		174
Inventory, net	$ 4,599	50,171
Prepaid expenses and other assets	77	1,262
Property and equipment, net	416	10,311
Accounts payable		(9,965)
Accrued liabilities	(359)	(2,438)
Other liabilities		(4,098)
Total tangible net assets acquired	4,733	46,008
Intangible assets acquired	318	35,561
Goodwill	3,579	36,467
Purchase price	8,630	118,036
Cash and cash equivalents acquired		(591)
Cash paid for acquisition, net of cash acquired	$ 8,630	111,725
Non-cash consideration		(5,720)
Outdoor Lifestyle Retail Businesses \| Membership and customer lists
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired		500
Estimated life (in years)	6 years
Outdoor Lifestyle Retail Businesses \| Trademarks and trade names
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired	$ 318	28,987
Estimated life (in years)	15 years
Outdoor Lifestyle Retail Businesses \| Websites
Assets (liabilities) acquired (assumed) at fair value:
Intangible assets acquired		$ 6,074
Estimated life (in years)	10 years

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

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

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Amount of accrued liabilities assumed at the acquisition date.

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Amount of deferred revenue and gains expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of tangible assets acquired at the acquisition date.

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Represents the amount of contracts in transit.

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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.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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