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Acquisitions and Dispositions (Details textuals) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Revenue | $ 10,417,000 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 9,770,000 us-gaap_BusinessAcquisitionsProFormaRevenue |
Business Acquisition, Cost of Acquired Entity, Purchase Price | 336,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 350,200,000 us-gaap_BusinessCombinationConsiderationTransferred1 |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Consideration received for franchise dispositions |  | 97,500,000 gpi_ProceedsFromDispositionsOfFranchises | 33,700,000 gpi_ProceedsFromDispositionsOfFranchises
Number Of Dealerships Acquired |  |  | 16 gpi_NumberOfDealershipsAcquired
Business Combination, Acquisition Related Costs |  | 6,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Payments to Acquire Businesses, Net of Cash Acquired | 336,551,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 269,860,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 177,956,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 1.39 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued |
Business Acquisition, Purchase Price Allocation, Liabilities Assumed |  | 65,100,000 gpi_Businessacquisitionliabilitiesassumedandextinguished |
Other Expenses | 0 us-gaap_OtherExpenses | (789,000)us-gaap_OtherExpenses | 0 us-gaap_OtherExpenses
Gain (Loss) on Sale of Business | 13,300,000 us-gaap_GainLossOnSaleOfBusiness | 10,200,000 us-gaap_GainLossOnSaleOfBusiness |
Proceeds From Disposition Of Franchise Property And Equipment | 144,597,000 gpi_ProceedsFromDispositionOfFranchisePropertyAndEquipment | 102,186,000 gpi_ProceedsFromDispositionOfFranchisePropertyAndEquipment | 39,197,000 gpi_ProceedsFromDispositionOfFranchisePropertyAndEquipment
UNITED STATES |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired | 7 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_US | 9 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_US | 10 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_US
Number of franchises awarded | 2 gpi_Numberoffranchisesawarded / gpi_CountriesAndStatesAxis = country_US |  |
Business Acquisition Purchase Price Allocation Goodwill | 103,900,000 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_US | 56,200,000 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_US |
Number of dealerships disposed | 7 gpi_NumberOfDealershipsDisposed / gpi_CountriesAndStatesAxis = country_US | 6 gpi_NumberOfDealershipsDisposed / gpi_CountriesAndStatesAxis = country_US | 3 gpi_NumberOfDealershipsDisposed / gpi_CountriesAndStatesAxis = country_US
Number of franchises disposed | 1 gpi_NumberOfFranchisesDisposed / gpi_CountriesAndStatesAxis = country_US | 1 gpi_NumberOfFranchisesDisposed / gpi_CountriesAndStatesAxis = country_US | 2 gpi_NumberOfFranchisesDisposed / gpi_CountriesAndStatesAxis = country_US
UNITED KINGDOM |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired | 3 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_GB | 4 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_GB | 6 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_GB
Business Acquisition Purchase Price Allocation Goodwill | 16,800,000 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_GB | 1,500,000 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_GB |
Number of dealerships disposed |  |  | 1 gpi_NumberOfDealershipsDisposed / gpi_CountriesAndStatesAxis = country_GB
BRAZIL |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired | 1 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_BR | 18 gpi_NumberOfDealershipsAcquired / gpi_CountriesAndStatesAxis = country_BR |
Number of franchises awarded | 1 gpi_Numberoffranchisesawarded / gpi_CountriesAndStatesAxis = country_BR |  |
Number of franchises acquired |  | 22 gpi_NumberOfFranchisesAcquired / gpi_CountriesAndStatesAxis = country_BR |
Number of collision centers acquired |  | 5 gpi_Numberofcollisioncentersacquired / gpi_CountriesAndStatesAxis = country_BR |
Business Acquisition Purchase Price Allocation Goodwill | $ 0 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_BR | $ 129,400,000 gpi_BusinessAcquisitionPurchasePriceAllocationGoodwill / gpi_CountriesAndStatesAxis = country_BR |
Number of dealerships disposed | 3 gpi_NumberOfDealershipsDisposed / gpi_CountriesAndStatesAxis = country_BR |  |

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- Definition Number of dealerships disposed. + References No definition available. + Details
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- Definition Number of franchises acquired. + References No definition available. + Details
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- Definition Cash inflow from the sale of long-lived physical assets, dealership franchises, and related real estate, as applicable. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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