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Credit Facilities (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) loan | Sep. 30, 2015 USD ($) loan | Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |
Assets Held-for-sale, Long Lived | $ (20,001) | $ (20,001) | $ (22,500)
Floorplan Offset | (28,073) | $ (28,073) | (39,616)
FMCC Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |
Maximum borrowing capacity under line of credit facility | 300,000 | $ 300,000 |
Line of Credit Facility, Amount Outstanding | 126,800 | 126,800 |
Available amount under borrowing capacity | $ 173,200 | $ 173,200 |
Cancellation of agreement | 30 days |  |
Debt interest rate | 4.75% | 4.75% |
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity under line of credit facility | $ 1,700,000 | $ 1,700,000 |
Line Of Credit Facility Maximum Borrowing Capacity Can Be Extended Amount | $ 1,950,000 | $ 1,950,000 |
Number of financial institutions | loan | 24 | 24 |
Number of Manufacturer-affiliated finance companies | loan | 6 | 6 |
Expiry date of Revolving Credit Facility | Jun. 20, 2018 |  |
Number of tranches | 2 | 2 |
Acquisition Line Minimum Commitment | $ 100,000 | $ 100,000 |
Line of credit facility, Unamortized Cost | 4,100 | 4,100 |
Restricted payment | 162,100 | 162,100 |
Maximum Limit Of Restricted Payment Basket | $ 125,000 | $ 125,000 |
Rental Vehicle Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt interest rate | 4.75% | 4.75% |
Maximum [Member] | Brazil Credit Facilities [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt interest rate | 23.73% | 23.73% |
Debt Instrument Maturity Date Period | 12 months |  |
Maximum [Member] | UK Credit Facilities [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt interest rate | 3.95% | 3.95% |
Minimum [Member] | Brazil Credit Facilities [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt interest rate | 16.77% | 16.77% |
Debt Instrument Maturity Date Period | 1 month |  |
Minimum [Member] | UK Credit Facilities [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt interest rate | 1.15% | 1.15% |
Acquisition Line [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |
Maximum borrowing capacity under line of credit facility | $ 320,000 | $ 320,000 |
Line Of Credit Facility, Minimum Borrowing Capacity | 100,000 | 100,000 |
Line of Credit Facility, Amount Outstanding | 138,201 | 138,201 | $ 69,713
Available amount under borrowing capacity | 122,000 | 122,000 |
Letters of credit outstanding | 45,700 | 45,700 |
Acquisition Line [Member] | Revolving Credit Facility [Member] | United States of America, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Amount Outstanding | 138,200 | 138,200 |
Acquisition Line [Member] | Revolving Credit Facility [Member] | Euros or Pound Sterling [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity under line of credit facility | $ 125,000 | $ 125,000 |
Acquisition Line [Member] | Maximum [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fees, Percentage | 0.45% |  |
Acquisition Line [Member] | Maximum [Member] | Revolving Credit Facility [Member] | United States of America, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |
Acquisition Line [Member] | Maximum [Member] | Revolving Credit Facility [Member] | Euros or Pound Sterling [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |
Acquisition Line [Member] | Minimum [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fees, Percentage | 0.25% |  |
Acquisition Line [Member] | Minimum [Member] | Revolving Credit Facility [Member] | United States of America, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.00% |
Acquisition Line [Member] | Minimum [Member] | Revolving Credit Facility [Member] | Euros or Pound Sterling [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |
Floorplan Line [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity under line of credit facility | $ 1,600,000 | $ 1,600,000 |
Commitment fees, Percentage | 0.20% |  |
Line of Credit Facility, Amount Outstanding | $ 1,148,300 | 1,148,300 |
Available amount under borrowing capacity | 231,700 | 231,700 |
Floorplan Offset | $ (28,100) | $ (28,100) |
Weighted average interest rate | 1.40% | 1.40% | 1.40%
Maximum period for outstanding borrowing | 1 year |  |
Floorplan Line [Member] | New Vehicles [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |
Floorplan Line [Member] | Used Vehicles [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |

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

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- Definition Debt Instrument Maturity Date Period + References No definition available. + Details
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- Definition FMCC Offset + References No definition available. + Details
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Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Floorplan offset. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line of credit facility, maximum borrowing capacity can be extended, amount. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility minimum borrowing capacity for working capital and general corporate purposes, including acquisitions. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- 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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- Definition Maximum period for outstanding borrowing. + References No definition available. + Details
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- Definition Number of days related to cancellation of contract. + References No definition available. + Details
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- Definition Restricted Payment Basket + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- 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 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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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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Balance Type: | credit
Period Type: | instant

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- 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 + 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 + Details
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Balance Type: | credit
Period Type: | instant

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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 + Details
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Balance Type: | credit
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- 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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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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