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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 540,100us-gaap_SecuredLongTermDebt	$ 0us-gaap_SecuredLongTermDebt
Line of Credit Facility, Amount Outstanding	1,098,126us-gaap_LineOfCreditFacilityAmountOutstanding
Capital Lease Obligations, Noncurrent	67,500us-gaap_CapitalLeaseObligationsNoncurrent	57,300us-gaap_CapitalLeaseObligationsNoncurrent
Total Debt	1,081,467us-gaap_DebtLongtermAndShorttermCombinedAmount	699,078us-gaap_DebtLongtermAndShorttermCombinedAmount
Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current	72,630gpi_LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	35,389gpi_LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent
Long-term Debt and Capital Lease Obligations	1,008,837us-gaap_LongTermDebtAndCapitalLeaseObligations	663,689us-gaap_LongTermDebtAndCapitalLeaseObligations
2.25% Convertible Notes due 2036
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	0us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember	160,334us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroThreeSixMember
3.00% Convertible Notes due 2020
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	0us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember	84,305us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_ConvertibleSeniorNotesDueTwoZeroTwoZeroMember
Real Estate Credit Facility [Member]
Debt Instrument [Line Items]
Other Long-term Debt	58,003us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember	67,719us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Other Real Estate Related and Long-Term Debt [Member]
Debt Instrument [Line Items]
Other Long-term Debt	358,271us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember	280,230us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = gpi_OtherRealEstateRelatedLongTermDebtMember
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Lease Obligations, Noncurrent	55,380us-gaap_CapitalLeaseObligationsNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	46,490us-gaap_CapitalLeaseObligationsNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Acquisition Line [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding		$ 60,000us-gaap_LineOfCreditFacilityAmountOutstanding / gpi_RevolvingCreditFacilityTrancheAxis = gpi_AcquisitionLineMember

X

- Definition

Long term debt and capital lease obligations excluding short term financing current.

+ References

No definition available.

+ Details

Name:	gpi_LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent
Namespace Prefix:	gpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount borrowed under the credit facility as of 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 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gpi_OtherRealEstateRelatedLongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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