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Acquisitions and Dispositions Acquisitions and Dispositions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Allocation of purchase price [Line Items]
Business Acquisition, Pro Forma Revenue	$ 10,417us-gaap_BusinessAcquisitionsProFormaRevenue	$ 9,770us-gaap_BusinessAcquisitionsProFormaRevenue
Assets, Current	2,035,219us-gaap_AssetsCurrent	1,967,938us-gaap_AssetsCurrent
Inventory, Net	1,556,705us-gaap_InventoryNet	1,542,318us-gaap_InventoryNet
Property, Plant and Equipment, Net	950,388us-gaap_PropertyPlantAndEquipmentNet	796,356us-gaap_PropertyPlantAndEquipmentNet
Deferred Tax Assets, Gross	99,265us-gaap_DeferredTaxAssetsGross	98,234us-gaap_DeferredTaxAssetsGross	2,300us-gaap_DeferredTaxAssetsGross
Total assets	4,141,492us-gaap_Assets	3,819,478us-gaap_Assets
Liabilities, Current	1,922,199us-gaap_LiabilitiesCurrent	1,865,176us-gaap_LiabilitiesCurrent
Deferred Tax Liabilities, Gross	186,044us-gaap_DeferredIncomeTaxLiabilities	199,997us-gaap_DeferredIncomeTaxLiabilities
Business Acquisition, Pro Forma Net Income (Loss)	95us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	126us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Businesses acquired [Member]
Allocation of purchase price [Line Items]
Assets, Current	6,601us-gaap_AssetsCurrent / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	26,884us-gaap_AssetsCurrent / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Inventory, Net	131,878us-gaap_InventoryNet / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	164,655us-gaap_InventoryNet / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Property, Plant and Equipment, Net	80,520us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	72,328us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Intangible Assets, Net (Including Goodwill)	183,449us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	305,876us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Deferred Tax Assets, Gross	7,265us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Other Assets		864us-gaap_OtherAssets / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Total assets	409,713us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	570,607us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Liabilities, Current	37,545us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	123,025us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Deferred Tax Liabilities, Gross		28,738us-gaap_DeferredIncomeTaxLiabilities / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Long-term Debt	13,250us-gaap_LongTermDebt / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	68,639us-gaap_LongTermDebt / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember
Liabilities	$ 50,795us-gaap_Liabilities / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember	$ 220,402us-gaap_Liabilities / us-gaap_BusinessAcquisitionAxis = gpi_BusinessesacquiredMember

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