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Property and Equipment (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Property Plant and Equipment (Textual) [Abstract] |  |  |
Depreciation and amortization | $ 31,500,000 us-gaap_OtherDepreciationAndAmortization | $ 42,300,000 us-gaap_OtherDepreciationAndAmortization | $ 35,800,000 us-gaap_OtherDepreciationAndAmortization
Building recorded under capital lease included in property plant equipment before accumulated depreciation |  | 67,500,000 us-gaap_CapitalLeaseObligationsNoncurrent | 57,300,000 us-gaap_CapitalLeaseObligationsNoncurrent
Property, Plant and Equipment [Line Items] |  |  |
Capital expenditures incurred for purchase and construction of assets |  | 97,700,000 us-gaap_PaymentsToAcquireProductiveAssets | 69,200,000 us-gaap_PaymentsToAcquireProductiveAssets
Assets Held-for-sale, Long Lived |  | 4,000,000 us-gaap_RealEstateHeldforsale |
Land and Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Acquisition of fixed assets |  | 62,700,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember | 38,800,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember
Dealership Acquisitions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Acquisition of fixed assets |  | 80,500,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember | 71,400,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember
Dealership Acquisitions [Member] | Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Acquisition of fixed assets |  | 34,200,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 21,600,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Dealership Acquisitions [Member] | Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Acquisition of fixed assets |  | $ 41,000,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember | $ 27,600,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_BusinessAcquisitionAxis = gpi_DealershipAcquisitionsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember

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- 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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- Definition The other noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of tangible and intangible assets over their remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + 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 (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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