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Long-Term Debt (Details Textual)	12 Months Ended						12 Months Ended			12 Months Ended			1 Months Ended	12 Months Ended				3 Months Ended		12 Months Ended					3 Months Ended	12 Months Ended		12 Months Ended						12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Brazilian Financial Institutions [Member] USD ($)	Dec. 31, 2014 Brazilian Financial Institutions [Member] BRL	Dec. 31, 2014 Acquisition Line [Member] USD ($)	Dec. 31, 2014 FMCC Facility [Member] USD ($)	Dec. 31, 2014 Foreign Note [Member] USD ($)	Dec. 31, 2013 Foreign Note [Member] USD ($)	Dec. 31, 2014 Convertible Notes [Member] USD ($)	Dec. 31, 2013 Convertible Notes [Member] USD ($)	Dec. 31, 2012 Convertible Notes [Member] USD ($)	Sep. 30, 2014 2.25% Convertible Notes due 2036 USD ($)	Dec. 31, 2014 2.25% Convertible Notes due 2036 USD ($)	Dec. 31, 2013 2.25% Convertible Notes due 2036 USD ($)	Dec. 31, 2012 2.25% Convertible Notes due 2036 USD ($)	Sep. 02, 2014 2.25% Convertible Notes due 2036 USD ($)	Sep. 30, 2014 3.00% Convertible Notes due 2020 USD ($)	Jun. 30, 2014 3.00% Convertible Notes due 2020 USD ($)	Dec. 31, 2014 3.00% Convertible Notes due 2020 USD ($)	Dec. 31, 2013 3.00% Convertible Notes due 2020 USD ($)	Dec. 31, 2012 3.00% Convertible Notes due 2020 USD ($)	Sep. 02, 2014 3.00% Convertible Notes due 2020 USD ($)	Jun. 25, 2014 3.00% Convertible Notes due 2020 USD ($)	Sep. 30, 2014 5.00% Senior Note [Member] USD ($)	Dec. 31, 2014 5.00% Senior Note [Member] USD ($)	Jun. 30, 2014 5.00% Senior Note [Member] USD ($)	Dec. 31, 2014 Real Estate Credit Facility [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] Minimum [Member]	Dec. 31, 2014 Real Estate Related Debt [Member] Maximum [Member]	Dec. 31, 2014 Real Estate Related Debt [Member] Toyota Motor Credit Corporation [Member] USD ($)	Dec. 31, 2013 Real Estate Related Debt [Member] Toyota Motor Credit Corporation [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] Mercedes-Benz Financial Services [Member] USD ($)	Dec. 31, 2013 Real Estate Related Debt [Member] Mercedes-Benz Financial Services [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] BMW Financial Services [Member] USD ($)	Dec. 31, 2013 Real Estate Related Debt [Member] BMW Financial Services [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] FMCC Facility [Member] USD ($)	Dec. 31, 2013 Real Estate Related Debt [Member] FMCC Facility [Member] USD ($)	Dec. 31, 2014 Real Estate Related Debt [Member] Third-party financial institution [Member] USD ($)	Dec. 31, 2013 Real Estate Related Debt [Member] Third-party financial institution [Member] USD ($)	Dec. 31, 2014 Fixed interest rate debt [Member] USD ($)	Dec. 31, 2013 Fixed interest rate debt [Member] USD ($)	Dec. 31, 2014 Real Estate Credit Facility, Real Estate Related Debt and Acquisition Line [Member] USD ($)	Dec. 31, 2013 Real Estate Credit Facility, Real Estate Related Debt and Acquisition Line [Member] USD ($)	Dec. 31, 2012 Real Estate Credit Facility, Real Estate Related Debt and Acquisition Line [Member] USD ($)	Dec. 31, 2014 Other Real Estate Related Long Term Debt [Member] USD ($)	Dec. 31, 2013 Other Real Estate Related Long Term Debt [Member] USD ($)	Dec. 31, 2014 Original terms [Member] Revolving Credit Facility [Member] USD ($)	Dec. 31, 2014 Amended terms [Domain] Revolving Credit Facility [Member] USD ($)
Debt Instrument [Line Items]
Original Debt Instrument Interest Rate Effective Percentage														7.50%gpi_OriginalDebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember						8.25%gpi_OriginalDebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember
Short-term Debt	$ 0us-gaap_ShortTermBorrowings	$ 800,000us-gaap_ShortTermBorrowings
Long Term Debt (Textual) [Abstract]
Debt interest rate														2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember												5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Convertible debt instrument conversion shares received													421,309gpi_Convertibledebtinstrumentconversionsharesreceived / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember
Call options duration														10 years
Repayments of Convertible Debt													237,500,000us-gaap_RepaymentsOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember					49,500,000us-gaap_RepaymentsOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	210,400,000us-gaap_RepaymentsOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember
Maturity date of of notes	Jun. 01, 2022			Feb. 01, 2017	Feb. 01, 2017			Sep. 01, 2034																								Nov. 21, 2021		Jan. 01, 2031		Oct. 01, 2021		Dec. 10, 2024		Nov. 30, 2022
Properties owned by subsidiaries	3gpi_Propertiesownedbysubsidiaries
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed																										35.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Redemption price percentage of principal outstanding and accrued unpaid interest																										105.00%gpi_Redemptionpricepercentageofprincipaloutstandingandaccruedunpaidinterest / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Redemption price percentage of principal redeemed																										100.00%gpi_Redemptionpricepercentageofprincipalredeemed / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Long-term Debt, Fair Value																										534,900,000us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember																186,400,000us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_FixedinterestratedebtMember	190,000,000us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_FixedinterestratedebtMember
Other Long-term Debt																																															358,271,000us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember	280,230,000us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember
Long-term Debt, Percentage Bearing Fixed Interest, Amount	158,100,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount	164,100,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Note agreement with a third party financial institution					38,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember								182,800,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember				182,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember		22,600,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember					115,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember		550,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember	350,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember													127,200,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Debt Instrument, Repurchased Face Amount																			92,500,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember				22,600,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember
Long-term Debt Underwriters Fees and Discount Original																										10,400,000gpi_LongtermDebtUnderwritersFeesandDiscountOriginal / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Amortization period of underwriters fees and debt issuance costs																										8 years
Debt Instrument, Unamortized Discount																										9,900,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Debt Issuance Cost																										2,400,000us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Debt Conversion, Converted Instrument, Shares Issued													701,795us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember
Redemption premium																												30,900,000us-gaap_RedemptionPremium / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Line of Credit Facility, Amount Outstanding	1,098,126,000us-gaap_LineOfCreditFacilityAmountOutstanding					69,713,000us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = gpi_AcquisitionLineMember
Revolving syndicated credit arrangement							300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember																																										1,350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gpi_AmendedtermsAxis = gpi_OriginaltermsMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember	1,700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gpi_AmendedtermsAxis = gpi_AmendedtermsDomain / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Amount available to be expanded																												99,100,000gpi_MaximumAmountOfTermLoanToBeExpandUnderAmendedAndRestatedCreditFacility / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Term Loans Utilized																												74,100,000gpi_TermLoansUtilized / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Capitalization of debt issuance costs																												1,100,000gpi_CapitalizationOfDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember	1,300,000gpi_CapitalizationOfDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Unamortized debt issuance cost																										2,300,000us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember		300,000us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember	483,000us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Interest rate under condition second																												0.95%gpi_InterestRateUnderConditionSecond / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Interest rate under sub-condition two of condition second																												0.50%gpi_InterestRateUnderSubConditionTwoOfConditionSecond / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Interest rate under sub-condition three of condition second																												1.05%gpi_InterestRateUnderSubConditionThreeOfConditionSecond / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Percentage of principal payments to make its quarterly payment																												1.25%gpi_PercentageOfQuarterlyPrincipalPaymentsOfOutstandingPrincipal / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Principal payments on outstanding borrowings																												9,900,000us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Borrowings under amended and restated mortgage facility																												58,000,000gpi_BorrowingsUnderAmendedAndRestatedMortgageFacility / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember
Interest on real estate notes, minimum																													3.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Interest on real estate notes, maximum																													9.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Amortization Cost of Mortgage Facility, Real Estate Related Debt and Acquisition Line	10,559,000us-gaap_AmortizationOfFinancingCostsAndDiscounts	13,888,000us-gaap_AmortizationOfFinancingCostsAndDiscounts	12,990,000us-gaap_AmortizationOfFinancingCostsAndDiscounts																																									300,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember	500,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember	500,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember
Impact of interest rate derivative instruments related to Mortgage Facility	1,500,000gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility	1,200,000gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility	1,200,000gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility
Total interest expense excluding amortization cost										17,000,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember	7,600,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember	7,600,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember		1,875,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember	4,112,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember	4,112,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember				1,839,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	3,450,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	3,450,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember																						15,300,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember	13,100,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember	12,700,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember
Amortization schedule																																20 years		20 years		15 years		20 years
Amortization cost of the 3.00% notes, 2.25% Notes and 8.25% Notes										8,000,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember	11,100,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember	10,200,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember		5,366,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember	7,530,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember	6,948,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember				1,810,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	3,251,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	2,966,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember
Variable Interest Rate							1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember																					2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember		1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember	2.55%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Total borrowings					14,600,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember			45,300,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember	37,700,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember																							49,900,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	51,600,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	27,400,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	45,500,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	66,000,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	70,100,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	35,100,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	5,400,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	115,200,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	69,800,000us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Long-term Debt, Current Maturities				6,400,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember				5,000,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember	10,400,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember																							5,100,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	7,000,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	7,600,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	1,700,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	4,500,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	4,100,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	1,400,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	200,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	6,500,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember	3,800,000us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Additional borrowings of long term debt								20,000,000gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember																	200,000,000gpi_Additionalborrowingsoflongtermdebt / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember							0gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		0gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		0gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		30,400,000gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		55,300,000gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
Additional borrowings discount from face value																										1.50%gpi_Additionalborrowingsdiscountfromfacevalue / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember
Principal Payments Of Long Term Debt Related To Real Estate Loans	50,033,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	36,978,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	15,197,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans					4,000,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember																								1,700,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		18,100,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		4,200,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		700,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember		4,500,000gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Indicates the number of mortgages under each classification.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The cash inflow associated with the amount received from holders exercising their stock warrants.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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