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Credit Facilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Line of Credit Facility [Line Items] |  |
Floorplan Notes Payable Credit Facility | $ 1,072,092 | $ 1,150,847
Floorplan Offset | 59,626 | 110,759
Other floorplan notes payable | 4,936 | 4,113
Total floorplan notes payable - credit facility and other net | 1,077,028 | 1,154,960
FMCC Offset | 25,500 | 25,500
Floorplan notes payable - manufacturer affiliates | 392,661 | 389,071
Floorplan Notes Payable Manufacturer Affiliates Net | 367,161 | 363,571
New Vehicles [Member] |  |
Line of Credit Facility [Line Items] |  |
Floorplan Notes Payable Credit Facility | 941,913 | 1,094,130
Used Vehicles [Member] |  |
Line of Credit Facility [Line Items] |  |
Floorplan Notes Payable Credit Facility | 160,070 | 142,703
Rental Vehicle Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Floorplan Notes Payable Credit Facility | 29,735 | 24,773
FMCC Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Floorplan Notes Payable Manufacturer Affiliates Gross | 175,244 | 196,807
Floorplan notes payable - manufacturer affiliates | 149,744 | 171,307
Other and Rental Vehicles [Member] |  |
Line of Credit Facility [Line Items] |  |
Floorplan notes payable - manufacturer affiliates | $ 217,417 | $ 192,264

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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

X
- 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: |