Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 16,781us-gaap_NetIncomeLoss	$ 12,014us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	33,959	29,056
Loss (gain) on sale of property and equipment	672	(84)
Stock-based compensation expense related to employee stock options and employee stock purchases	3,699us-gaap_ShareBasedCompensation	3,269us-gaap_ShareBasedCompensation
Deferred income tax (benefit)	(1,629)us-gaap_DeferredIncomeTaxExpenseBenefit	(165)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax expense (benefit) from stock-based compensation	423	(1,021)
Change in accounts receivable, net	(34,816)us-gaap_IncreaseDecreaseInReceivables	(25,387)us-gaap_IncreaseDecreaseInReceivables
Change in inventories, net	(84,894)us-gaap_IncreaseDecreaseInInventories	(24,282)us-gaap_IncreaseDecreaseInInventories
Change in prepaid expenses and other, net	11,929	2,024
Change in trade accounts payable	(3,029)	11,981
(Payments) draws on floor plan notes payable – trade, net	(5,057)	20,463
Change in customer deposits	(6,331)	(27,432)
Change in accrued expenses	(28,280)	(7,525)
Net cash (used in) operating activities	(96,573)	(7,089)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(82,455)	(53,202)
Proceeds from the sale of property and equipment	2,121	134
Business acquisitions	(27,849)	(143,050)
Change in other assets	(1,743)	1,892
Net cash used in investing activities	(109,926)	(194,226)
CASH FLOWS FROM FINANCING ACTIVITIES:
Draws on floor plan notes payable – non-trade, net	71,680	45,177
Proceeds from long-term debt	39,222	61,929
Principal payments on long-term debt	(45,085)us-gaap_RepaymentsOfLongTermDebt	(24,813)us-gaap_RepaymentsOfLongTermDebt
Principal payments on capital lease obligations	(3,211)	(3,086)
Issuance of shares relating to employee stock options and employee stock purchases	1,592	1,947
Excess tax benefits (expense) from stock-based compensation	(423)	1,021
Common stock repurchased	(1,464)	(3,796)
Net cash provided by (used in) financing activities	62,311	78,379
NET DECREASE IN CASH AND CASH EQUIVALENTS	(144,188)	(122,936)
CASH AND CASH EQUIVALENTS, beginning of period	191,463	217,305
CASH AND CASH EQUIVALENTS, end of period	47,275	94,369
Cash paid during the period for:
Interest	8,381us-gaap_InterestPaid	7,343us-gaap_InterestPaid
Income taxes, net of refunds	143us-gaap_IncomeTaxesPaidNet	1,578us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:
Common stock issued related to business acquisition		2,000us-gaap_StockIssued1
Assets acquired under capital leases	$ 5,338us-gaap_FairValueOfAssetsAcquired	$ 3,562us-gaap_FairValueOfAssetsAcquired

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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

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.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The fair value of stock issued in noncash financing activities.

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