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Asset Impairments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Assets Impairments (Textual) [Abstract] |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 25,600 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 5,500 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 5,400 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 7,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | $ 31,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |  |
Other Asset Impairment Charges |  |  |  |  | 9,200 us-gaap_OtherAssetImpairmentCharges |  |
Pre-tax impairment charges of real estate |  |  |  |  | 1,300 us-gaap_ImpairmentOfRealEstate |  |
Increase in assumed risk free rate to estimate WACC |  |  |  |  | 2.00%gpi_IncreaseInAssumedRiskFreeRateToEstimateWacc |  |
Pre tax impairment charges of other long lived assets |  |  |  |  |  | 1,100 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 300 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
No new vehicle sales growth [Member] |  |  |  |  |  |  |
Assumption scenario [Line Items] |  |  |  |  |  |  |
Additional franchise rights impairment charge |  |  |  |  | 2,000 gpi_Additionalfranchiserightsimpairmentcharge / gpi_AssumptionscenarioAxis = gpi_NonewvehiclesalesgrowthMember |  |
WACC increased 200 bps [Member] |  |  |  |  |  |  |
Assumption scenario [Line Items] |  |  |  |  |  |  |
Additional franchise rights impairment charge |  |  |  |  | $ 14,000 gpi_Additionalfranchiserightsimpairmentcharge / gpi_AssumptionscenarioAxis = gpi_WACCincreased200bpsMember |  |

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- Definition Additional franchise rights impairment charge + References No definition available. + Details
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- Definition Increase in assumed risk free rate to estimate WACC. + References No definition available. + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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