Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
New and used commercial vehicle sales	$ 800,194us-gaap_SalesRevenueGoodsNet	$ 600,900us-gaap_SalesRevenueGoodsNet
Parts and service sales	337,022rusha_PartsAndServiceSales	308,974rusha_PartsAndServiceSales
Lease and rental	47,792	40,989
Finance and insurance	4,531rusha_FinanceAndInsuranceNet	4,076rusha_FinanceAndInsuranceNet
Other	3,996us-gaap_OtherSalesRevenueNet	3,728us-gaap_OtherSalesRevenueNet
Total revenue	1,193,535us-gaap_Revenues	958,667us-gaap_Revenues
Cost of products sold:
New and used commercial vehicle sales	744,260us-gaap_CostOfGoodsSold	558,142us-gaap_CostOfGoodsSold
Parts and service sales	214,697	198,703
Lease and rental	40,956us-gaap_LeaseAndRentalExpense	35,897us-gaap_LeaseAndRentalExpense
Total cost of products sold	999,913us-gaap_CostOfRevenue	792,742us-gaap_CostOfRevenue
Gross profit	193,622us-gaap_GrossProfit	165,925us-gaap_GrossProfit
Selling, general and administrative	152,627	134,445
Depreciation and amortization	9,994us-gaap_DepreciationAndAmortization	8,818us-gaap_DepreciationAndAmortization
Gain (loss) on sale of assets	(672)us-gaap_GainLossOnDispositionOfAssets	84us-gaap_GainLossOnDispositionOfAssets
Operating income	30,329us-gaap_OperatingIncomeLoss	22,746us-gaap_OperatingIncomeLoss
Interest expense, net	2,941us-gaap_InterestIncomeExpenseNet	3,131us-gaap_InterestIncomeExpenseNet
Income before taxes	27,388	19,615
Provision for income taxes	10,607us-gaap_IncomeTaxExpenseBenefit	7,601us-gaap_IncomeTaxExpenseBenefit
Net income	16,781us-gaap_NetIncomeLoss	12,014us-gaap_NetIncomeLoss
Earnings per common share:
Earnings per common share - Basic (in Dollars per share)	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic
Earnings per common share - Diluted (in Dollars per share)	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in Shares)	40,066	39,332
Diluted (in Shares)	40,985	40,511
Comprehensive income	$ 16,853us-gaap_ComprehensiveIncomeNetOfTax	$ 12,128us-gaap_ComprehensiveIncomeNetOfTax

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