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

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- Definition Amount of significant additions in the period in other assets (current, noncurrent, or unclassified). + 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 210.5-02.17) -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 17 -Article 5 + Details
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