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Credit Facilities (Details Textual) (USD $) |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  | 9 Months Ended | 3 Months Ended |  |  | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Brazil Credit Facilities [Member] Maximum [Member] | Sep. 30, 2014 Brazil Credit Facilities [Member] Minimum [Member] | Sep. 30, 2014 FMCC Facility [Member] | Sep. 30, 2014 FMCC Facility [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] loan | Sep. 30, 2013 Revolving Credit Facility [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Acquisition Line [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] Maximum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] Minimum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] United States of America, Dollars | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] United States of America, Dollars Maximum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] United States of America, Dollars Minimum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] Euros or Pound Sterling [Member] Maximum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Acquisition Line [Member] Euros or Pound Sterling [Member] Minimum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Floorplan Line [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Floorplan Line [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Floorplan Line [Member] Maximum [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Floorplan Line [Member] Used Vehicle [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Floorplan Line [Member] New Vehicle [Member] | Sep. 30, 2014 Rental Vehicle Credit Facility [Member] | Sep. 30, 2014 UK Credit Facilities [Member] Maximum [Member] | Sep. 30, 2014 UK Credit Facilities [Member] Minimum [Member]
Credit Facility (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 1.50% |  |  | 1.50% |  |  |  |  | 1.00% | 0.00% | 2.50% | 1.50% |  |  |  | 1.50% | 1.25% |  |  |
Maximum borrowing capacity under line of credit facility |  |  |  |  | $ 300,000,000 | $ 300,000,000 | $ 1,700,000,000 | $ 1,350,000,000 |  |  | $ 320,000,000 | $ 100,000,000 |  |  |  | $ 125,000,000 |  |  |  | $ 1,600,000,000 |  |  |  |  |
Number of financial institution |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Manufacturer-affiliated finance companies |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiry date of Revolving Credit Facility |  |  |  |  |  |  | Jun. 20, 2018 | Jun. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity can be extended, amount |  |  |  |  |  |  | 1,950,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees, Percentage |  |  |  |  |  |  |  |  |  |  | 0.45% | 0.25% |  |  |  |  |  | 0.20% |  |  |  |  |  |  |
Acquisition Line Minimum Commitment |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unamortized cost |  |  |  |  |  |  | 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  | 146,100,000 | 146,100,000 |  |  | 0 | 60,000,000 |  |  | 0 |  |  |  |  | 1,029,800,000 |  |  |  |  |  |  |
Available amount under borrowing capacity |  |  |  |  | 153,900,000 | 153,900,000 |  |  | 252,300,000 |  |  |  |  |  |  |  |  | 350,200,000 |  |  |  |  |  |  |
Assets Held-for-sale, Long Lived | 25,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floorplan Offset | (37,516,000) | (56,198,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (37,500,000) |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% | 1.40% |  |  |  |  |  |
Maximum period for outstanding borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 0 months 0 days |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  | 43,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted payment |  |  |  |  |  |  | 176,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Limit Of Restricted Payment Basket |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of agreement |  |  |  |  | 0 years 0 months 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 19.56% | 15.11% | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.75% | 3.95% | 1.40%
Debt Instrument Maturity Date Period |  |  | 12 months | 1 month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Acquisition line minimum commitment. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Details
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- Definition Debt Instrument Maturity Date Period + References No definition available. + Details
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X
- Definition Floorplan offset. + References No definition available. + Details
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Period Type: | instant

X
- Definition FMCC Offset + References No definition available. + Details
Name: | gpi_FMCCOffset
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line of credit facility, maximum borrowing capacity can be extended, amount. + References No definition available. + Details
Name: | gpi_LineOfCreditFacilityMaximumBorrowingCapacityCanBeExtendedAmount
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of credit facility, unamortized cost. + References No definition available. + Details
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Balance Type: | debit
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- Definition Maximum Limit Of Restricted Payment Basket + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maximum period for outstanding borrowing. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of days related to cancellation of contract. + References No definition available. + Details
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- Definition Number of financial institutions. + References No definition available. + Details
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- Definition Number of Manufacturer-affiliated finance companies. + References No definition available. + Details
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- Definition Number of tranches + References No definition available. + Details
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X
- Definition Restricted payment. + References No definition available. + Details
Name: | gpi_RestrictedPayment
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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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
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X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + Details
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Balance Type: | credit
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X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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