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Note 15 - Acquisitions (Details) (USD $) | 12 Months Ended | 1 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2014 | Jun. 25, 2014 | Dec. 08, 2014 | Nov. 03, 2014 | Jul. 01, 2014 | Jan. 13, 2014 | Oct. 28, 2013 | Sep. 30, 2013 | Jul. 29, 2013 | Jul. 01, 2013 | May 06, 2013 | Dec. 31, 2012
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 157,626,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 72,725,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 104,571,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense | 2,000,000 us-gaap_ResearchAndDevelopmentExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] | CNG Fuel Systems [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  | 2,000,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_ProductOrServiceAxis = rusha_CNGFuelSystemsMember |  |  |  |  |  |  |  |  |  |  |
CCTTS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rusha_CCTTSMember |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  | 2,200,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rusha_CCTTSMember |  |  |  |  |  |  |  |  |  |
North Florida Truck Parts, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | 1,600,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
House of Trucks, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | 6,900,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |
Truck Parts Depot Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  | 500,000,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rusha_TruckPartsDepotIncMember |  |  |  |  |  |  |
CIT, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 146,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) |  |  |  |  |  |  |  |  | 83,091 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |  |  |
Prairie International Trucks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  | 9,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
TransAuthority, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  | 41,700,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rusha_TransAuthorityIncMember |  |  |  |
Business Combination, Value of Real Estate Transferred |  |  |  |  |  |  |  |  |  |  | 11,100,000 rusha_BusinessCombinationValueOfRealEstateTransferred / us-gaap_BusinessAcquisitionAxis = rusha_TransAuthorityIncMember |  |  |  |
Midwest Truck Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  | 16,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |  |  |
Business Combination, Value of Real Estate Transferred |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 rusha_BusinessCombinationValueOfRealEstateTransferred / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |  |  |
Larson Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rusha_LarsonGroupMember |  |
Piedmont International Trucks, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember |
Acquisition of MVI Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 104,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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