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Note 11 - Share Based Compensation and Employee Benefit Plans (Details) (USD $)	12 Months Ended			11 Months Ended	13 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Jan. 31, 2012	May 20, 2014	May 18, 2010	May 16, 2006
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	459,058
Allocated Share-based Compensation Expense	$ 11,300,000	$ 8,600,000	$ 7,300,000
Proceeds from Stock Options Exercised	12,500,000	10,000,000	5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	18,700,000	10,500,000	5,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	3,300,000	3,400,000	2,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 15.86	$ 12.69	$ 10.95
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 26.81	$ 22.12	$ 21.98
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	15,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 255 days
Every Six Months [Member] \| Employee Stock Purchase Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	10,625
Common Class A [Member] \| Restricted Stock Units (RSUs) [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	25,550
Common Class A [Member] \| Restricted Stock Units (RSUs) [Member] \| The 2007 Long-Term Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)		241,930
Common Class A [Member] \| Shares Issued to Three Non-Employee Directors [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued (in Shares)		4,512
Common Class A [Member] \| Shares Issued to One Non-Employee Director [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued (in Shares)	3,101	2,707
Common Class A [Member] \| Shares Issued to Four Nonemployee Directors [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued (in Shares)	3,877
Common Class A [Member] \| Shares Issued to One Non-Employee Director 2 [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued (in Shares)	2,326
Common Class A [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	218,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	500,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in Shares)	20,935	16,243
Common Class A [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	1,805,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)						6,050,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in Shares)	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	459,058
Common Class A [Member] \| The 2007 Long-Term Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)		400,633
Common Class A [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share Price (in Dollars per share)	$ 32.05
Common Class B [Member] \| Per Year [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in Shares)	100,000
Common Class B [Member] \| Restricted Stock Units (RSUs) [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	207,370
Common Class B [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	1,013,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)						1,450,000
Restricted Stock Units (RSUs) [Member] \| Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Restricted Stock [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	253,855
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 26.81
Deferred Compensation Plan [Member
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Deferred Compensation Arrangement With Individual, Vested Percentage		100.00%
Deferred Compensation Liability, Current	3,000,000	1,700,000
Cash Surrender Value of Life Insurance	2,900,000	1,600,000
Rush 401k Plan [Member] \| Minimum [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Rush 401k Plan [Member] \| Maximum [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Rush 401k Plan [Member] \| Highly Compensated Employees [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%
Rush 401k Plan [Member] \| Employees With Less Than Five Years Of Service [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match				20.00%	15.00%
Rush 401k Plan [Member] \| Employees With More Than Five Years Of Service [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match				40.00%	30.00%
Rush 401k Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Contribution Plan Period For Eligibility	90 days
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay				10.00%	10.00%
Defined Contribution Plan, Cost Recognized	5,200,000	4,400,000	3,700,000
Shares Issued to One Non-Employee Director [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Payment to Non-Employee Directors	25,000	50,000
Issuance of Stock and Cash for Non-employee Director Compensation	125,000	125,000
Shares Issued to One Non-Employee Director 2 [Member] \| The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Payment to Non-Employee Directors	50,000
Issuance of Stock and Cash for Non-employee Director Compensation	125,000
Employee Stock Purchase Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Maximum Fair Value for Employee Stock Purchase Per Year	$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	250,500
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)	900,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)	64,090	79,681
Number Of Employees Eligible To Participate In Stock Purchase Plan	6,297
Number Of Employees Participating In Stock Purchase Plan	837
The 2006 Non-Employee Director Stock Option Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)								1,500,000
Reduction in Number of Shares Reserved for Issuance (in Shares)							1,000,000
Number of Shares Available for Purchase with Options by Non-Employee Director Each Year (in Shares)	20,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Amended and Restated 2007 Incentive Plan [Member]
Note 11 - Share Based Compensation and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years