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Income Taxes (Detail 3) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Net deferred tax liabilities comprised      
Loss reserves and accruals $ 50,158,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves $ 43,451,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves  
Interest rate swaps 10,745,000gpi_DeferredTaxAssetsInterestRateSwaps 8,310,000gpi_DeferredTaxAssetsInterestRateSwaps  
State net operating loss ("NOL") carryforwards 16,592,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 14,231,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 21,770,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 13,056,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign  
Deferred Tax Assets, Gross 99,265,000us-gaap_DeferredTaxAssetsGross 98,234,000us-gaap_DeferredTaxAssetsGross 2,300,000us-gaap_DeferredTaxAssetsGross
Valuation allowance on state NOL (40,486,000)us-gaap_DeferredTaxAssetsValuationAllowance (28,310,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred Tax Assets, Net of Valuation Allowance 58,779,000us-gaap_DeferredTaxAssetsNet 69,924,000us-gaap_DeferredTaxAssetsNet  
Goodwill and intangible franchise rights (138,992,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (141,384,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets  
Depreciation expense (43,070,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (39,285,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Deferred tax liabilities deferred gain on bond redemption (2,046,000)gpi_Deferredtaxliabilitiesdeferredgainonbondredemption 0gpi_Deferredtaxliabilitiesdeferredgainonbondredemption  
Other (1,936,000)us-gaap_DeferredTaxLiabilitiesOther (999,000)us-gaap_DeferredTaxLiabilitiesOther  
Deferred Tax Liabilities, Gross (186,044,000)us-gaap_DeferredIncomeTaxLiabilities (199,997,000)us-gaap_DeferredIncomeTaxLiabilities  
Deferred Tax Liabilities, Net, Noncurrent 202,100,000us-gaap_DeferredTaxLiabilitiesNoncurrent 216,200,000us-gaap_DeferredTaxLiabilitiesNoncurrent  
Net deferred tax liability (127,265,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (130,073,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
2.25% Notes [Member]      
Net deferred tax liabilities comprised      
Convertible Debt 0gpi_DeferredTaxAssetsConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_TwoPointTwoFivePercentNotesMember		 6,639,000gpi_DeferredTaxAssetsConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_TwoPointTwoFivePercentNotesMember		  
Discount on deferred tax assets 0gpi_DeferredTaxLiabilitiesDiscountOnConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_TwoPointTwoFivePercentNotesMember		 (7,846,000)gpi_DeferredTaxLiabilitiesDiscountOnConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_TwoPointTwoFivePercentNotesMember		  
3.00% Notes [Member]      
Net deferred tax liabilities comprised      
Convertible Debt 0gpi_DeferredTaxAssetsConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_ThreePointZeroZeroPercentNotesMember		 12,547,000gpi_DeferredTaxAssetsConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_ThreePointZeroZeroPercentNotesMember		  
Discount on deferred tax assets $ 0gpi_DeferredTaxLiabilitiesDiscountOnConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_ThreePointZeroZeroPercentNotesMember		 $ (10,483,000)gpi_DeferredTaxLiabilitiesDiscountOnConvertibleNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= gpi_ThreePointZeroZeroPercentNotesMember