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Credit Facilities - Outstanding Balances under Financing Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Line of Credit Facility [Line Items] |  |
Floorplan notes payable - credit facility | $ 1,217,765 | $ 1,133,296
Offset account related to floorplan notes payable - credit facility | (33,637) | (86,547)
Other floorplan notes payable | 41,050 | 20,852
Total floorplan notes payable - credit facility and other | 1,258,815 | 1,154,148
Offset account related to floorplan notes payable - manufacturer affiliates | (100) | (22,500)
Floorplan notes payable - manufacturer affiliates | 417,924 | 397,183
Total floorplan notes payable — manufacturer affiliates | 417,824 | 374,683
New vehicles |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - credit facility | 1,063,710 | 1,019,511
Used vehicles |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - credit facility | 167,578 | 176,802
Rental vehicles |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - credit facility | 20,114 | 23,530
FMCC Facility |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - manufacturer affiliates | 160,786 | 152,984
Floorplan notes payable - manufacturer affiliates | 160,686 | 130,484
Foreign and rental vehicles |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - manufacturer affiliates | $ 257,138 | $ 244,199

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- Definition FMCC Offset + References No definition available. + Details
Name: | gpi_FMCCOffset
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amounts payable for the purchase of specific new, used and rental vehicle inventory whereby financing is provided by the Company's revolving syndicated credit arrangement (including the offset amount). Payments on the floorplan notes payable are generally due as the vehicles are sold. + References No definition available. + Details
Name: | gpi_FloorplanNotesPayableCreditFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amounts payable for the financing of specific new vehicle inventory with Ford Motor Credit Company, the financing of new and used vehicle inventory in the United Kingdom with BMW Financial Services and the financing of rental vehicle inventory with several other manufacturers. Payments on floor plan notes payable are generally due as the vehicles are sold. + References No definition available. + Details
Name: | gpi_FloorplanNotesPayableManufacturerAffiliates
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floorplan Notes Payable Manufacturer Affiliates Gross + References No definition available. + Details
Name: | gpi_FloorplanNotesPayableManufacturerAffiliatesGross
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floorplan Notes Payable Manufacturer Affiliates Net + References No definition available. + Details
Name: | gpi_FloorplanNotesPayableManufacturerAffiliatesNet
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floorplan offset. + References No definition available. + Details
Name: | gpi_FloorplanOffset
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other floorplan notes payable + References No definition available. + Details
Name: | gpi_Otherfloorplannotespayable
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total floorplan notes payable - credit facility and other net + References No definition available. + Details
Name: | gpi_Totalfloorplannotespayablecreditfacilityandothernet
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gpi_NewVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gpi_UsedVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gpi_RentalVehicleCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gpi_FMCCFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gpi_OtherAndRentalVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |