Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 79,957us-gaap_NetIncomeLoss	$ 49,217us-gaap_NetIncomeLoss	$ 62,455us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities-
Depreciation and amortization	126,452	93,486	73,289
Gain on sale of property and equipment, net	(151)	(5)	(176)
Stock-based compensation expense related to employee stock options and employee stock purchases	11,343us-gaap_ShareBasedCompensation	8,645us-gaap_ShareBasedCompensation	7,332us-gaap_ShareBasedCompensation
Provision for deferred income tax expense	25,229us-gaap_DeferredIncomeTaxExpenseBenefit	22,081us-gaap_DeferredIncomeTaxExpenseBenefit	28,164us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation	(5,207)	(2,566)	(1,668)
Acquired research and development	2,000us-gaap_ResearchAndDevelopmentExpense
Change in accounts receivable, net	(67,664)us-gaap_IncreaseDecreaseInReceivables	(10,358)us-gaap_IncreaseDecreaseInReceivables	14,184us-gaap_IncreaseDecreaseInReceivables
Change in inventories	(151,911)us-gaap_IncreaseDecreaseInInventories	(67,217)us-gaap_IncreaseDecreaseInInventories	32,579us-gaap_IncreaseDecreaseInInventories
Change in prepaid expenses and other, net	(13,215)	(1,789)	558
Change in trade accounts payable	24,180	38,105	(29)
Draws on floor plan notes payable – trade, net	44,870	13,044	34,504
Change in customer deposits	(13,802)	29,139	(25,347)
Change in accrued expenses	26,856	1,706	(6,509)
Net cash provided by operating activities	88,937	173,488	219,336
Cash flows from investing activities:
Acquisition of property and equipment	(260,820)	(191,584)	(170,951)
Proceeds from the sale of property and equipment	249	633	1,249
Business acquisitions	(157,626)	(72,725)	(104,571)
Proceeds from the sale of available for sale securities	150
Other	1,631	(5,992)	(24)
Net cash used in investing activities	(416,416)	(269,668)	(274,297)
Cash flows from financing activities:
Draws (payments) on floor plan notes payable – non-trade, net	207,458	46,085	(20,677)
Proceeds from long-term debt	214,622	171,166	144,639
Principal payments on long-term debt	(112,828)us-gaap_RepaymentsOfLongTermDebt	(88,048)us-gaap_RepaymentsOfLongTermDebt	(73,151)us-gaap_RepaymentsOfLongTermDebt
Principal payments on capital lease obligations	(12,531)	(13,511)	(11,584)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	11,962	9,327	5,064
Excess tax benefits from stock-based compensation	5,207	2,566	1,668
Common stock repurchased	(12,253)	(12,873)
Net cash provided by financing activities	301,637	114,712	45,959
Net increase (decrease) in cash and cash equivalents	(25,842)	18,532	(9,002)
Cash and cash equivalents, beginning of year	217,305	198,773	207,775
Cash and cash equivalents, end of year	191,463	217,305	198,773
Cash paid during the year for:
Interest	29,539us-gaap_InterestPaid	24,195us-gaap_InterestPaid	23,275us-gaap_InterestPaid
Income taxes, net of refunds	29,795us-gaap_IncomeTaxesPaidNet	9,314us-gaap_IncomeTaxesPaidNet	7,122us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:
Common stock issued related to business acquisition	2,000us-gaap_StockIssued1
Assets acquired under capital leases	$ 24,314us-gaap_FairValueOfAssetsAcquired	$ 9,005us-gaap_FairValueOfAssetsAcquired	$ 15,892us-gaap_FairValueOfAssetsAcquired

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The fair value of stock issued in noncash financing activities.

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