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Commitments and Contingencies (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Lessee rental payment obligations during remaining terms of leases under guarantee agreement |  | $ 38.6
Letters of credit issued on behalf of lessee | $ 7.1 |

X
- Definition Guarantor Obligations, Maximum Exposure Inestimable, Minimum Lease Payments Guaranteed + References No definition available. + Details
Name: | gpi_GuarantorObligationsMaximumExposureInestimableMinimumLeasePaymentsGuaranteed
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Letters of Credit Outstanding as Beneficiary + References No definition available. + Details
Name: | gpi_LettersofCreditOutstandingasBeneficiary
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration