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Note 17 - Unaudited Quarterly Financial Data (Details) - Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
2014
Revenues	$ 4,727,356us-gaap_Revenues	$ 3,384,705us-gaap_Revenues	$ 3,090,567us-gaap_Revenues
Gross profit	756,046us-gaap_GrossProfit	572,014us-gaap_GrossProfit	500,767us-gaap_GrossProfit
Operating income	141,741us-gaap_OperatingIncomeLoss	91,754us-gaap_OperatingIncomeLoss	114,200us-gaap_OperatingIncomeLoss
Income before income taxes	130,543us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	81,061us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	101,183us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income	79,957us-gaap_NetIncomeLoss	49,217us-gaap_NetIncomeLoss	62,455us-gaap_NetIncomeLoss
Earnings per share:
Basic (in Dollars per share)	$ 2.01us-gaap_EarningsPerShareBasic	$ 1.25us-gaap_EarningsPerShareBasic	$ 1.62us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 1.96us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 1.57us-gaap_EarningsPerShareDiluted
First Quarter [Member]
2014
Revenues	958,667us-gaap_Revenues / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Gross profit	165,925us-gaap_GrossProfit / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Operating income	22,746us-gaap_OperatingIncomeLoss / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Income before income taxes	19,615us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Net income	12,014us-gaap_NetIncomeLoss / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Earnings per share:
Basic (in Dollars per share)	$ 0.31us-gaap_EarningsPerShareBasic / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Diluted (in Dollars per share)	$ 0.30us-gaap_EarningsPerShareDiluted / us-gaap_CreationDateAxis = rusha_FirstQuarterMember
Second Quarter [Member]
2014
Revenues	1,182,461us-gaap_Revenues / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Gross profit	193,349us-gaap_GrossProfit / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Operating income	34,932us-gaap_OperatingIncomeLoss / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Income before income taxes	32,389us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Net income	19,838us-gaap_NetIncomeLoss / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Earnings per share:
Basic (in Dollars per share)	$ 0.50us-gaap_EarningsPerShareBasic / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Diluted (in Dollars per share)	$ 0.49us-gaap_EarningsPerShareDiluted / us-gaap_CreationDateAxis = rusha_SecondQuarterMember
Third Quarter [Member]
2014
Revenues	1,241,022us-gaap_Revenues / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Gross profit	198,739us-gaap_GrossProfit / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Operating income	41,018us-gaap_OperatingIncomeLoss / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Income before income taxes	38,329us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Net income	23,478us-gaap_NetIncomeLoss / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Earnings per share:
Basic (in Dollars per share)	$ 0.59us-gaap_EarningsPerShareBasic / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Diluted (in Dollars per share)	$ 0.57us-gaap_EarningsPerShareDiluted / us-gaap_CreationDateAxis = rusha_ThirdQuarterMember
Fourth Quarter [Member]
2014
Revenues	1,345,206us-gaap_Revenues / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Gross profit	198,033us-gaap_GrossProfit / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Operating income	43,045us-gaap_OperatingIncomeLoss / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Income before income taxes	40,210us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Net income	$ 24,627us-gaap_NetIncomeLoss / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Earnings per share:
Basic (in Dollars per share)	$ 0.62us-gaap_EarningsPerShareBasic / us-gaap_CreationDateAxis = rusha_FourthQuarterMember
Diluted (in Dollars per share)	$ 0.60us-gaap_EarningsPerShareDiluted / us-gaap_CreationDateAxis = rusha_FourthQuarterMember

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