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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 |  |  |
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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 | $ 0 us-gaap_ShortTermBorrowings | $ 800,000 us-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 |  |  |  |  |  |  |  |  |  |  |  |  | 421,309 gpi_Convertibledebtinstrumentconversionsharesreceived / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call options duration |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  | 237,500,000 us-gaap_RepaymentsOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  |  | 49,500,000 us-gaap_RepaymentsOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 210,400,000 us-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 | 3 gpi_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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 534,900,000 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 186,400,000 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_FixedinterestratedebtMember | 190,000,000 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = gpi_FixedinterestratedebtMember |  |  |  |  |  |  |
Other Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 358,271,000 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember | 280,230,000 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | 158,100,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount | 164,100,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note agreement with a third party financial institution |  |  |  |  | 38,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember |  |  |  |  |  |  |  | 182,800,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  | 182,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  | 22,600,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  |  | 115,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  | 550,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember | 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  |  |  |  |  |  |  | 127,200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,500,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  | 22,600,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Underwriters Fees and Discount Original |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,400,000 gpi_LongtermDebtUnderwritersFeesandDiscountOriginal / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of underwriters fees and debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 701,795 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,900,000 us-gaap_RedemptionPremium / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 1,098,126,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |  |  | 69,713,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = gpi_AcquisitionLineMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving syndicated credit arrangement |  |  |  |  |  |  | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,350,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gpi_AmendedtermsAxis = gpi_OriginaltermsMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 1,700,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gpi_AmendedtermsAxis = gpi_AmendedtermsDomain / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Amount available to be expanded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,100,000 gpi_MaximumAmountOfTermLoanToBeExpandUnderAmendedAndRestatedCreditFacility / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loans Utilized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,100,000 gpi_TermLoansUtilized / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 gpi_CapitalizationOfDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember | 1,300,000 gpi_CapitalizationOfDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  | 300,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember | 483,000 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,900,000 us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under amended and restated mortgage facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 gpi_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 | 10,559,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 13,888,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 12,990,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember | 500,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember | 500,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember |  |  |  |
Impact of interest rate derivative instruments related to Mortgage Facility | 1,500,000 gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility | 1,200,000 gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility | 1,200,000 gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expense excluding amortization cost |  |  |  |  |  |  |  |  |  | 17,000,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember | 7,600,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember | 7,600,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember |  | 1,875,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember | 4,112,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember | 4,112,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  | 1,839,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 3,450,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 3,450,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember | 13,100,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityRealEstateRelatedDebtandAcquisitionLineMember | 12,700,000 us-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 |  |  |  |  |  |  |  |  |  | 8,000,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember | 11,100,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember | 10,200,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleAndSubordinatedDebtMember |  | 5,366,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember | 7,530,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember | 6,948,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  | 1,810,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 3,251,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 2,966,000 us-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 |  |  |  |  | 14,600,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember |  |  | 45,300,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember | 37,700,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,900,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 51,600,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 27,400,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 45,500,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 66,000,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 70,100,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 35,100,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 5,400,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 115,200,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 69,800,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |
Long-term Debt, Current Maturities |  |  |  | 6,400,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BrazilianFinancialInstitutionsMember |  |  |  | 5,000,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember | 10,400,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 7,000,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 7,600,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 1,700,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 4,500,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 4,100,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 1,400,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 200,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 6,500,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember | 3,800,000 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |
Additional borrowings of long term debt |  |  |  |  |  |  |  | 20,000,000 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LongtermDebtTypeAxis = gpi_A5.00SeniorNoteMember |  |  |  |  |  |  | 0 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 0 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 0 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 30,400,000 gpi_Additionalborrowingsoflongtermdebt / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 55,300,000 gpi_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 | 50,033,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans | 36,978,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans | 15,197,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans |  |  |  |  | 4,000,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ForeignNoteMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 18,100,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 4,200,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 700,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 4,500,000 gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |  |
Number of loans as per loan agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ToyotaMotorCreditCorporationMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 2 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LineOfCreditFacilityAxis = gpi_MercedesBenzFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 14 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LineOfCreditFacilityAxis = gpi_BmwFinancialServicesMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 4 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LineOfCreditFacilityAxis = gpi_FmccFacilityMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  | 19 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LineOfCreditFacilityAxis = gpi_ThirdPartyFinancialInstitutionMember / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateRelatedDebtMember |  |  |  |  |  |  |  |  |  |
Additional Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 gpi_AdditionalBorrowings / us-gaap_LongtermDebtTypeAxis = gpi_RealEstateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock value acquired cost method | 36,802,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 3,554,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 11,317,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest costs capitalized on construction projects | 700,000 us-gaap_InterestCostsCapitalized | 800,000 us-gaap_InterestCostsCapitalized | 700,000 us-gaap_InterestCostsCapitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expense related to capital leases, net of interest income | 7,500,000 gpi_InterestExpenseRelatedToCapitalLeasesAndVariousOtherNotesPayableNetOfInterestIncome | 5,500,000 gpi_InterestExpenseRelatedToCapitalLeasesAndVariousOtherNotesPayableNetOfInterestIncome | 5,300,000 gpi_InterestExpenseRelatedToCapitalLeasesAndVariousOtherNotesPayableNetOfInterestIncome |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | (46,403,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |  | 16,900,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember |  |  |  | 5,900,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | 23,600,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000 us-gaap_ProceedsFromWarrantExercises / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember | $ 26,400,000 us-gaap_ProceedsFromWarrantExercises / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Additional borrowings. + References No definition available. + Details
Name: | gpi_AdditionalBorrowings
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Additional borrowings discount from face value + References No definition available. + Details
Name: | gpi_Additionalborrowingsdiscountfromfacevalue
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Additional borrowings of long term debt + References No definition available. + Details
Name: | gpi_Additionalborrowingsoflongtermdebt
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortization period of underwriters fees and debt issuance costs + References No definition available. + Details
Name: | gpi_Amortizationperiodofunderwritersfeesanddebtissuancecosts
Namespace Prefix: | gpi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amortization schedule of loan agreement. + References No definition available. + Details
Name: | gpi_AmortizationScheduleOfLoanAgreement
Namespace Prefix: | gpi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Borrowings under amended and restated mortgage facility. + References No definition available. + Details
Name: | gpi_BorrowingsUnderAmendedAndRestatedMortgageFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Call options duration + References No definition available. + Details
Name: | gpi_Calloptionsduration
Namespace Prefix: | gpi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Capitalization of debt issuance costs. + References No definition available. + Details
Name: | gpi_CapitalizationOfDebtIssuanceCosts
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Convertible debt instrument conversion shares received + References No definition available. + Details
Name: | gpi_Convertibledebtinstrumentconversionsharesreceived
Namespace Prefix: | gpi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Impact of interest rate derivative instruments related to mortgage facility. + References No definition available. + Details
Name: | gpi_ImpactOfInterestRateDerivativeInstrumentsRelatedToMortgageFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total interest expense related to capital leases, net of interest income. + References No definition available. + Details
Name: | gpi_InterestExpenseRelatedToCapitalLeasesAndVariousOtherNotesPayableNetOfInterestIncome
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest rate under condition second. + References No definition available. + Details
Name: | gpi_InterestRateUnderConditionSecond
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate under sub-condition three of condition second. + References No definition available. + Details
Name: | gpi_InterestRateUnderSubConditionThreeOfConditionSecond
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate under sub-condition two of condition second. + References No definition available. + Details
Name: | gpi_InterestRateUnderSubConditionTwoOfConditionSecond
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | gpi_LongTermDebtTextualAbstract
Namespace Prefix: | gpi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-term Debt Underwriters Fees and Discount Original + References No definition available. + Details
Name: | gpi_LongtermDebtUnderwritersFeesandDiscountOriginal
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum amount of term loan to be expand under amended and restated credit facility. + References No definition available. + Details
Name: | gpi_MaximumAmountOfTermLoanToBeExpandUnderAmendedAndRestatedCreditFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Original Debt Instrument Interest Rate Effective Percentage + References No definition available. + Details
Name: | gpi_OriginalDebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of quarterly principal payments of outstanding principal. + References No definition available. + Details
Name: | gpi_PercentageOfQuarterlyPrincipalPaymentsOfOutstandingPrincipal
Namespace Prefix: | gpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow resulting from principal payments on borrowings under real estate loans. + References No definition available. + Details
Name: | gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Properties owned by subsidiaries + References No definition available. + Details
Name: | gpi_Propertiesownedbysubsidiaries
Namespace Prefix: | gpi_
Data Type: | xbrli:pureItemType
Balance Type: | na
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