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