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Note 2 - Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 30, 2013 | May 31, 2013
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Depreciation | $ 115,300,000 us-gaap_Depreciation | $ 82,300,000 us-gaap_Depreciation |  |  |
Amortization | 11,200,000 us-gaap_AdjustmentForAmortization | 11,200,000 us-gaap_AdjustmentForAmortization |  |  |
Capitalized Computer Software, Net | 38,500,000 us-gaap_CapitalizedComputerSoftwareNet |  |  |  |
Capitalized Computer Software, Accumulated Amortization | 10,300,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |
Indefinite-Lived Franchise Rights | 6,900,000 us-gaap_IndefiniteLivedFranchiseRights | 4,500,000 us-gaap_IndefiniteLivedFranchiseRights |  |  |
Goodwill and Intangible Asset Impairment | 0 us-gaap_GoodwillAndIntangibleAssetImpairment |  |  |  |
Advertising Expense | 8,700,000 us-gaap_AdvertisingExpense | 6,800,000 us-gaap_AdvertisingExpense | 4,400,000 us-gaap_AdvertisingExpense |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Derivative Asset, Notional Amount | 20,900,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |  |  |
SAP Enterprise Software And SAP Dealership Management System [Member] | Sales Revenue, Net [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 90.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis = rusha_SAPEnterpriseSoftwareAndSAPDealershipManagementSystemMember |  |  |  |
Rush Truck Centers [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Number of Stores | 101 us-gaap_NumberOfStores / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = rusha_RushTruckCentersMember |  |  |  |
Vehicles [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Net | 54,800,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Property, Plant, and Equipment Other, Accumulated Depreciation | 21,500,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassPropertyPlantAndEquipmentOtherAccumulatedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  |  |  |
Computer Software, Intangible Asset [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Interest Costs Capitalized | 244,000 us-gaap_InterestCostsCapitalized / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |  |  |  |
Capitalized Computer Software, Net | 38,500,000 us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 40,800,000 us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |  |  |
Capitalized Computer Software, Accumulated Amortization | 10,300,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 7,100,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |  |
Amortization of Intangible Assets | 3,200,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 3,000,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 3,000,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |  |
Former Chairman [Member] |  |  |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Pension and Other Postretirement Benefit Expense |  |  |  | $ 10,800,000 us-gaap_PensionAndOtherPostretirementBenefitExpense / us-gaap_TitleOfIndividualAxis = rusha_FormerChairmanMember | $ 10,800,000 us-gaap_PensionAndOtherPostretirementBenefitExpense / us-gaap_TitleOfIndividualAxis = rusha_FormerChairmanMember

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