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

X

- 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

X

- 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:

X

- 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: