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Credit Facilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
FMCC Offset	$ 21,000gpi_FMCCOffset	$ 22,500gpi_FMCCOffset
Outstanding balances under financing arrangements
Floorplan Offset	(79,795)gpi_FloorplanOffset	(39,616)gpi_FloorplanOffset
Floorplan notes payable - manufacturer affiliates	$ 290,038gpi_FloorplanNotesPayableManufacturerAffiliates	$ 307,656gpi_FloorplanNotesPayableManufacturerAffiliates

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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 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

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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- Details

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

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- Details

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