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Note 15 - Acquisitions (Details) - Purchase Price Allocation (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 08, 2014 | Nov. 03, 2014 | Jan. 13, 2014 | Oct. 28, 2013 | Sep. 30, 2013 | Jul. 29, 2013 | May 06, 2013
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 265,145 us-gaap_Goodwill | $ 215,464 us-gaap_Goodwill | $ 198,257 us-gaap_Goodwill |  |  |  |  |  |  |
North Florida Truck Parts, Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 1,048 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |
Property, plant and equipment |  |  |  | 448 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |
Inventory |  |  |  | 50 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |
Accounts receivable |  |  |  | 20 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |
Total purchase price |  |  |  | 1,566 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_NorthFloridaTruckPartsIncMember |  |  |  |  |  |
House of Trucks, Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,968 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
Property, plant and equipment |  |  |  |  | 2,416 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
Prepaid expenses |  |  |  |  | 6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
Accrued expenses |  |  |  |  | (28)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
Inventory |  |  |  |  | 2,512 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
Total purchase price |  |  |  |  | 6,874 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_HouseOfTrucksIncMember |  |  |  |  |
CIT, Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 46,384 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Franchise rights |  |  |  |  |  | 2,442 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Property, plant and equipment |  |  |  |  |  | 60,066 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Prepaid expenses |  |  |  |  |  | 750 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Other |  |  |  |  |  | 23 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Accrued expenses |  |  |  |  |  | (1,325)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Inventory |  |  |  |  |  | 31,048 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Accounts receivable |  |  |  |  |  | 7,175 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Total purchase price |  |  |  |  |  | 146,563 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_CITIncMember |  |  |  |
Prairie International Trucks [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2,832 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Property, plant and equipment |  |  |  |  |  |  | 3,209 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Prepaid expenses |  |  |  |  |  |  | (56)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Other |  |  |  |  |  |  | 3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Accrued expenses |  |  |  |  |  |  | (23)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Inventory |  |  |  |  |  |  | 2,174 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Accounts receivable |  |  |  |  |  |  | 1,401 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Total purchase price |  |  |  |  |  |  | 9,540 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_PrairieInternationalTrucksMember |  |  |
Transauthority, Inc., Transauthority Idealease, LLC and Transauthority Idealease-Tidewater, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 7,798 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Property, plant and equipment |  |  |  |  |  |  |  | 26,829 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Prepaid expenses |  |  |  |  |  |  |  | 471 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Other |  |  |  |  |  |  |  | 66 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Accrued expenses |  |  |  |  |  |  |  | (213)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Inventory |  |  |  |  |  |  |  | 5,177 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Accounts receivable |  |  |  |  |  |  |  | 1,554 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Total purchase price |  |  |  |  |  |  |  | 41,682 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_TransauthorityIncTransauthorityIdealeaseLLCAndTransauthorityIdealeaseTidewaterLLCMember |  |
Midwest Truck Sales [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 5,624 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Property, plant and equipment |  |  |  |  |  |  |  |  | 4,333 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Prepaid expenses |  |  |  |  |  |  |  |  | 39 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Other |  |  |  |  |  |  |  |  | 53 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Accrued expenses |  |  |  |  |  |  |  |  | (61)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Inventory |  |  |  |  |  |  |  |  | 6,792 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Total purchase price |  |  |  |  |  |  |  |  | 16,780 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_MidwestTruckSalesMember |
Piedmont International Trucks, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 1,485 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Prepaid expenses |  |  |  |  |  |  |  |  |  | 10 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Accrued expenses |  |  |  |  |  |  |  |  |  | (76)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Inventory |  |  |  |  |  |  |  |  |  | 1,720 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Accounts receivable |  |  |  |  |  |  |  |  |  | 364 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Total purchase price |  |  |  |  |  |  |  |  |  | 3,503 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_PiedmontInternationalTrucksLLCMember
Acquisition of MVI Group [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 17,365 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Property, plant and equipment |  |  | 29,768 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Prepaid expenses |  |  | 488 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Accrued expenses |  |  | (200)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Inventory |  |  | 51,476 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Accounts receivable |  |  | 5,638 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |
Total purchase price |  |  | $ 104,535 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rusha_AcquisitionOfMVIGroupMember |  |  |  |  |  |  |

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