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Note 18 - Segments (Details) - Segment Reporting Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
2014
Revenues from external customers, by segment	$ 4,727,356us-gaap_Revenues	$ 3,384,705us-gaap_Revenues	$ 3,090,567us-gaap_Revenues
Interest income, by segment	239us-gaap_InvestmentIncomeInterest	41us-gaap_InvestmentIncomeInterest	21us-gaap_InvestmentIncomeInterest
Interest expense, by segment	11,437us-gaap_InterestExpense	10,734us-gaap_InterestExpense	13,038us-gaap_InterestExpense
Depreciation and amortization, by segment	40,786us-gaap_DepreciationAndAmortization	29,925us-gaap_DepreciationAndAmortization	25,016us-gaap_DepreciationAndAmortization
Segment income (loss) from continuing operations before taxes, by segment	130,543us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	81,061us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	101,183us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Segment assets, by segment	2,694,262us-gaap_Assets	2,167,798us-gaap_Assets	1,881,566us-gaap_Assets
Goodwill, by segment	265,145us-gaap_GoodwillGross	215,464us-gaap_GoodwillGross	198,257us-gaap_GoodwillGross
Expenditures for segment assets, by segment	263,123us-gaap_AdditionsToOtherAssetsAmount	191,584us-gaap_AdditionsToOtherAssetsAmount	170,951us-gaap_AdditionsToOtherAssetsAmount
Truck Segment [Member]
2014
Revenues from external customers, by segment	4,708,978us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	3,365,900us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	3,072,092us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Interest income, by segment	239us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	41us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	21us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Interest expense, by segment	11,278us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	10,559us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	12,830us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Depreciation and amortization, by segment	40,283us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	29,403us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	24,482us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Segment income (loss) from continuing operations before taxes, by segment	131,035us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	81,856us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	102,392us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Segment assets, by segment	2,664,405us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	2,140,008us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	1,855,431us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Goodwill, by segment	262,585us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	212,904us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	195,697us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Expenditures for segment assets, by segment	262,613us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	191,016us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember	170,436us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = rusha_TruckSegmentMember
Other Segments [Member]
2014
Revenues from external customers, by segment	18,378us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	18,805us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	18,475us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Interest expense, by segment	159us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	175us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	208us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Depreciation and amortization, by segment	503us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	522us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	534us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment income (loss) from continuing operations before taxes, by segment	(492)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(795)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(1,209)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment assets, by segment	29,857us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	27,790us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	26,135us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Goodwill, by segment	2,560us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	2,560us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	2,560us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Expenditures for segment assets, by segment	$ 510us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 568us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 515us-gaap_AdditionsToOtherAssetsAmount / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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