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BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF ACCOUNTING POLICIES - Goodwill and Intangible Franchise Rights (Details) | 12 Months Ended
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Dec. 31, 2024 region
U.S and U.K |
Segment Reporting Information |
Number of geographic regions | 2

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Namespace Prefix: | gpi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ReportingUnitAxis=gpi_UnitedStatesAndUnitedKingdomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |