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Segment Information Details [Textual] (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]            
Business Combination, Acquisition Related Costs         $ 6,500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts  
Asset Impairment Charge 30,400,000us-gaap_AssetImpairmentCharges 9,400,000us-gaap_AssetImpairmentCharges 1,700,000us-gaap_AssetImpairmentCharges 41,520,000us-gaap_AssetImpairmentCharges 6,542,000us-gaap_AssetImpairmentCharges 7,276,000us-gaap_AssetImpairmentCharges
Gains (Losses) on Extinguishment of Debt       (46,403,000)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
UNITED STATES            
Segment Reporting Information [Line Items]            
Net Gain (Loss) on Real Estate and Dealership Transactions   16,600,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
      1,500,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Tax impact of non-deductible acquisition costs         1,700,000gpi_Taximpactofnondeductibleacquisitioncosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Gains (Losses) on Extinguishment of Debt   22,800,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
23,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
     
BRAZIL            
Segment Reporting Information [Line Items]            
Income tax effect for reserve of certain deferred tax assets         3,500,000gpi_Incometaxeffectforreserveofcertaindeferredtaxassets
/ us-gaap_StatementBusinessSegmentsAxis
= country_BR
 
Tax impact of deductible goodwill   3,400,000gpi_Taximpactofdeductiblegoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_BR
       
Pre-tax [Member] | UNITED STATES            
Segment Reporting Information [Line Items]            
Loss from Catastrophes       2,800,000us-gaap_LossFromCatastrophes
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
12,200,000us-gaap_LossFromCatastrophes
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
4,600,000us-gaap_LossFromCatastrophes
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
Net Gain (Loss) on Real Estate and Dealership Transactions       13,800,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
10,200,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
1,500,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
Business Combination, Acquisition Related Costs         5,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
1,800,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
Pre-tax [Member] | BRAZIL            
Segment Reporting Information [Line Items]            
Business Combination, Acquisition Related Costs         1,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_BR
/ gpi_TaxeffectedAxis
= gpi_PretaxMember
 
Net of taxes [Member] | UNITED STATES            
Segment Reporting Information [Line Items]            
Loss from Catastrophes         7,400,000us-gaap_LossFromCatastrophes
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
2,900,000us-gaap_LossFromCatastrophes
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
Net Gain (Loss) on Real Estate and Dealership Transactions         5,400,000gpi_NetGainLossonRealEstateandDealershipTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
 
Business Combination, Acquisition Related Costs         3,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
1,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
Asset Impairment Charge         4,000,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
4,400,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember
Net of taxes [Member] | BRAZIL            
Segment Reporting Information [Line Items]            
Business Combination, Acquisition Related Costs         $ 1,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= country_BR
/ gpi_TaxeffectedAxis
= gpi_NetoftaxesMember