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Note 8 - Long-term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 8 - Long-term Debt (Details) [Line Items]
Long-term Debt	$ 578,254,000us-gaap_LongTermDebt	$ 482,781,000us-gaap_LongTermDebt
Debt Instrument, Covenant, Leverage Ratio Maximum	2.50rusha_DebtInstrumentCovenantLeverageRatioMaximum
Leverage Ratio	2.52rusha_LeverageRatio
Variable Interest Rate Notes [Member] | Minimum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Debt Instrument, Periodic Payment	1,910us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = rusha_VariableInterestRateNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Variable Interest Rate Notes [Member] | Maximum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Debt Instrument, Periodic Payment	80,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = rusha_VariableInterestRateNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Fixed Interest Rate Notes [Member] | Minimum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Debt Instrument, Periodic Payment	98us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = rusha_FixedInterestRateNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Fixed Interest Rate Notes [Member] | Maximum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Debt Instrument, Periodic Payment	59,437us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = rusha_FixedInterestRateNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
GE Capital Credit Agreement [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Long-term Debt	677,800,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rusha_GECapitalCreditAgreementMember
Wells Fargo Equipment Finance, Inc. Loan Agreement [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Long-term Debt	$ 82,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rusha_WellsFargoEquipmentFinanceIncLoanAgreementMember
Minimum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.60%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.42%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.00%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	8.02%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Represents the maximum leverage ratio covenant of a debt instrument.

+ References

No definition available.

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- Definition

Represents an entity's leverage ratio.

+ References

No definition available.

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- Definition

Amount of the required periodic payments including both interest and principal payments.

+ 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 210.5-02.22)

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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- Definition

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+ References

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-Publisher FASB

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-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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