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Note 5 - Inventories (Details) - Inventories (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventories [Abstract] |  |
New commercial vehicles | $ 749,615 rusha_InventoryNewCommercialVehiclesGross | $ 566,396 rusha_InventoryNewCommercialVehiclesGross
Used commercial vehicles | 84,972 rusha_InventoryUsedCommercialVehiclesGross | 75,731 rusha_InventoryUsedCommercialVehiclesGross
Parts and accessories | 186,208 us-gaap_OtherInventoryPurchasedGoods | 157,873 us-gaap_OtherInventoryPurchasedGoods
Other | 19,020 us-gaap_OtherInventory | 14,031 us-gaap_OtherInventory
Less allowance | (15,711)us-gaap_InventoryValuationReserves | (11,811)us-gaap_InventoryValuationReserves
Total | $ 1,024,104 us-gaap_InventoryNet | $ 802,220 us-gaap_InventoryNet

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- Definition Inventory, New Commercial Vehicles, Gross. + References No definition available. + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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