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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Net carrying amount of liability component | $ 1,147,239 us-gaap_DebtLongtermAndShorttermCombinedAmount | $ 1,081,467 us-gaap_DebtLongtermAndShorttermCombinedAmount
Less current maturities of mortgage facility and other long-term debt | 69,275 gpi_LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent | 72,630 gpi_LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent
LONG-TERM DEBT, net of current maturities | 1,077,964 us-gaap_LongTermDebtAndCapitalLeaseObligations | 1,008,837 us-gaap_LongTermDebtAndCapitalLeaseObligations
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Other Real Estate Related and Long-Term Debt | 57,168 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 58,003 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Other Real Estate Related Long-Term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Other Real Estate Related and Long-Term Debt | 371,382 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember | 358,271 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Capital lease obligations related to real estate, maturing in varying amounts through June 2034 with a weighted average interest rate of 9.6% | $ 54,569 us-gaap_CapitalLeaseObligationsNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | $ 55,380 us-gaap_CapitalLeaseObligationsNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember

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- Definition Long term debt and capital lease obligations excluding short term financing current. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Details
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