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v2.4.1.9

Segment Information Details [Textual] (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 6,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Asset Impairment Charge | 30,400,000 us-gaap_AssetImpairmentCharges | 9,400,000 us-gaap_AssetImpairmentCharges | 1,700,000 us-gaap_AssetImpairmentCharges | 41,520,000 us-gaap_AssetImpairmentCharges | 6,542,000 us-gaap_AssetImpairmentCharges | 7,276,000 us-gaap_AssetImpairmentCharges
Gains (Losses) on Extinguishment of Debt |  |  |  | (46,403,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
UNITED STATES |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Gain (Loss) on Real Estate and Dealership Transactions |  | 16,600,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US |  |  |  | 1,500,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US
Tax impact of non-deductible acquisition costs |  |  |  |  | 1,700,000 gpi_Taximpactofnondeductibleacquisitioncosts / us-gaap_StatementBusinessSegmentsAxis = country_US |
Gains (Losses) on Extinguishment of Debt |  | 22,800,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = country_US | 23,400,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = country_US |  |  |
BRAZIL |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Income tax effect for reserve of certain deferred tax assets |  |  |  |  | 3,500,000 gpi_Incometaxeffectforreserveofcertaindeferredtaxassets / us-gaap_StatementBusinessSegmentsAxis = country_BR |
Tax impact of deductible goodwill |  | 3,400,000 gpi_Taximpactofdeductiblegoodwill / us-gaap_StatementBusinessSegmentsAxis = country_BR |  |  |  |
Pre-tax [Member] | UNITED STATES |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Loss from Catastrophes |  |  |  | 2,800,000 us-gaap_LossFromCatastrophes / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember | 12,200,000 us-gaap_LossFromCatastrophes / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember | 4,600,000 us-gaap_LossFromCatastrophes / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember
Net Gain (Loss) on Real Estate and Dealership Transactions |  |  |  | 13,800,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember | 10,200,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember | 1,500,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember
Business Combination, Acquisition Related Costs |  |  |  |  | 5,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember | 1,800,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_PretaxMember
Pre-tax [Member] | BRAZIL |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 1,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_BR / gpi_TaxeffectedAxis = gpi_PretaxMember |
Net of taxes [Member] | UNITED STATES |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Loss from Catastrophes |  |  |  |  | 7,400,000 us-gaap_LossFromCatastrophes / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember | 2,900,000 us-gaap_LossFromCatastrophes / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember
Net Gain (Loss) on Real Estate and Dealership Transactions |  |  |  |  | 5,400,000 gpi_NetGainLossonRealEstateandDealershipTransactions / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember |
Business Combination, Acquisition Related Costs |  |  |  |  | 3,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember | 1,100,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember
Asset Impairment Charge |  |  |  |  | 4,000,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember | 4,400,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = country_US / gpi_TaxeffectedAxis = gpi_NetoftaxesMember
Net of taxes [Member] | BRAZIL |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 1,300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = country_BR / gpi_TaxeffectedAxis = gpi_NetoftaxesMember |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + 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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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