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Credit Facilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Outstanding balances under financing arrangements |  |
Floorplan notes payable - credit facility | $ 1,098,126 gpi_FloorplanNotesPayableCreditFacility | $ 1,068,832 gpi_FloorplanNotesPayableCreditFacility
Other floorplan notes payable | 5,504 gpi_Otherfloorplannotespayable | 18,074 gpi_Otherfloorplannotespayable
Total floorplan notes payable - credit facility and other net | 1,103,630 gpi_Totalfloorplannotespayablecreditfacilityandothernet | 1,086,906 gpi_Totalfloorplannotespayablecreditfacilityandothernet
Floorplan Notes Payable Credit Facility Gross | 1,143,246 gpi_FloorplanNotesPayableCreditFacilityGross | 1,143,104 gpi_FloorplanNotesPayableCreditFacilityGross
Offset account related to floorplan notes payable - credit facility | (39,616)gpi_FloorplanOffset | (56,198)gpi_FloorplanOffset
Floorplan notes payable - manufacturer affiliates | 307,656 gpi_FloorplanNotesPayableManufacturerAffiliates | 346,572 gpi_FloorplanNotesPayableManufacturerAffiliates
FMCC Offset | (22,500)gpi_FMCCOffset | 0 gpi_FMCCOffset
Floorplan Notes Payable Manufacturer Affiliates Net | 285,156 gpi_FloorplanNotesPayableManufacturerAffiliatesNet |
New Vehicle [Member] |  |
Outstanding balances under financing arrangements |  |
Floorplan notes payable - credit facility | 970,075 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_NewVehicleMember | 970,780 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_NewVehicleMember
Used Vehicle [Member] |  |
Outstanding balances under financing arrangements |  |
Floorplan notes payable - credit facility | 125,085 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_UsedVehicleMember | 127,808 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_UsedVehicleMember
Rental Vehicle [Member] |  |
Outstanding balances under financing arrangements |  |
Floorplan notes payable - credit facility | 42,582 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_RentalVehicleCreditFacilityMember | 26,442 gpi_FloorplanNotesPayableCreditFacility / us-gaap_LineOfCreditFacilityAxis = gpi_RentalVehicleCreditFacilityMember
FMCC Facility [Member] |  |
Outstanding balances under financing arrangements |  |
Floorplan Notes Payable Manufacturer Affiliates Gross | 150,183 gpi_FloorplanNotesPayableManufacturerAffiliatesGross / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember |
Floorplan Notes Payable Credit Facility Gross |  | 190,954 gpi_FloorplanNotesPayableCreditFacilityGross / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember
Floorplan notes payable - manufacturer affiliates | 127,683 gpi_FloorplanNotesPayableManufacturerAffiliates / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember | 190,954 gpi_FloorplanNotesPayableManufacturerAffiliates / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember
Other and Rental Vehicles [Member] |  |
Outstanding balances under financing arrangements |  |
Floorplan notes payable - manufacturer affiliates | $ 157,473 gpi_FloorplanNotesPayableManufacturerAffiliates / us-gaap_LineOfCreditFacilityAxis = gpi_OtherAndRentalVehiclesMember | $ 155,618 gpi_FloorplanNotesPayableManufacturerAffiliates / us-gaap_LineOfCreditFacilityAxis = gpi_OtherAndRentalVehiclesMember

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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

X
- Definition Floorplan Notes Payable Credit Facility Gross + References No definition available. + Details
Name: | gpi_FloorplanNotesPayableCreditFacilityGross
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- 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

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

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

X
- 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

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

X
- 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_NewVehicleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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