Value of input used to measure noncontrolling interest in the acquiree at the acquisition date.

No definition available.

Name:	rusha_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestMeasurementInputs
Namespace Prefix:	rusha_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of deferred tax liability attributable to taxable temporary differences from reclassification of foreign currency translation adjustment.

+ References

No definition available.

+ Details

Name:	rusha_DeferredTaxLiabilitiesReclassificationOfForeignCurrencyTranslationAdjustment
Namespace Prefix:	rusha_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of deferred tax liability attributable to taxable temporary differences from re-measurement of equity method investment.

+ References

No definition available.

+ Details

Name:	rusha_DeferredTaxLiabilitiesRemeasurementOfEquityMethodInvestment
Namespace Prefix:	rusha_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)(1)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(2)
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-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
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-Publisher FASB
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-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

+ Details

Name:	us-gaap_GoodwillGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=rusha_RtcCanadaMember
Namespace Prefix:
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=rusha_RtcCanadaMember
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Data Type:	na
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- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
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Data Type:	na
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- Details

Name:	srt_OwnershipAxis=rusha_RtcCanadaMember
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Note 12 - Acquisitions (Details Textual) - USD ($) $ in Thousands		6 Months Ended
	May 02, 2022	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	May 01, 2022
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		$ 6,958
Goodwill, Gross			$ 417,465	$ 416,363
RTC Canada [Member]
Equity Method Investment, Ownership Percentage	30.00%				50.00%
RTC Canada [Member]
Business Acquisition, Percentage of Voting Interests Acquired	30.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	80.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	$ 44,700
Deferred Tax Liabilities, Reclassification of Foreign Currency Translation Adjustment	2,200
Deferred Tax Liabilities, Re-measurement of Equity Method Investment	600
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	17,828
Goodwill, Gross	$ 44,200
RTC Canada [Member] \| Measurement Input, Discount Rate [Member]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Measurement Inputs	0.11
RTC Canada [Member] \| RTC Canada [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner	20.00%
RTC Canada [Member] \| Other Income (Expense) [Member]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 7,000