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Note 14 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Construction Contracts for Facilities [Member]
Note 14 - Commitments and Contingencies (Details) [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 49.0us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = rusha_ConstructionContractsForFacilitiesMember
Information Technology Contracts [Member]
Note 14 - Commitments and Contingencies (Details) [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 22.5us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = rusha_InformationTechnologyContractsMember

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- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ 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 210.5-02.25)

-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 25

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.17)

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



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a)(19))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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