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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic and Diluted Earnings per share |  |  |  |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding |  |  |  |  |  |  |  |  | 23,380 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,096 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 21,620 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of contingently convertible notes and warrants |  |  |  |  |  |  |  |  | 1,499 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 2,213 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 1,058 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Dilutive effect of stock options, net of assumed repurchase of treasury stock |  |  |  |  |  |  |  |  | 0 gpi_DilutiveEffectOfStockOptionsNetOfAssumedRepurchaseOfTreasuryStock | 0 gpi_DilutiveEffectOfStockOptionsNetOfAssumedRepurchaseOfTreasuryStock | 4 gpi_DilutiveEffectOfStockOptionsNetOfAssumedRepurchaseOfTreasuryStock
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock |  |  |  |  |  |  |  |  | 6 gpi_DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock | 5 gpi_DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock | 6 gpi_DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock
Weighted average dilutive common shares outstanding |  |  |  |  |  |  |  |  | 24,885 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,314 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,688 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 93,004 us-gaap_NetIncomeLoss | $ 113,992 us-gaap_NetIncomeLoss | $ 100,209 us-gaap_NetIncomeLoss
Less: Earning allocated to participating securities |  |  |  |  |  |  |  |  | 3,643 gpi_EarningAllocatedToParticipatingSecuritiesBasic | 4,963 gpi_EarningAllocatedToParticipatingSecuritiesBasic | 5,269 gpi_EarningAllocatedToParticipatingSecuritiesBasic
Earnings available to basic common shares |  |  |  |  |  |  |  |  | 89,361 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 109,029 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 94,940 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share | $ 0.77 us-gaap_EarningsPerShareBasic | $ 1.07 us-gaap_EarningsPerShareBasic | $ 0.70 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 0.89 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.53 us-gaap_EarningsPerShareBasic | $ 0.95 us-gaap_EarningsPerShareBasic | $ 3.82 us-gaap_EarningsPerShareBasic | $ 4.72 us-gaap_EarningsPerShareBasic | $ 4.39 us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 93,004 us-gaap_NetIncomeLoss | 113,992 us-gaap_NetIncomeLoss | 100,209 us-gaap_NetIncomeLoss
Less: Earning allocated to participating securities |  |  |  |  |  |  |  |  | 3,468 gpi_EarningAllocatedToParticipatingSecuritiesDiluted | 4,599 gpi_EarningAllocatedToParticipatingSecuritiesDiluted | 5,062 gpi_EarningAllocatedToParticipatingSecuritiesDiluted
Earnings available to diluted common shares |  |  |  |  |  |  |  |  | $ 89,536 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 109,393 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 95,147 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted earnings per common share | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 0.81 us-gaap_EarningsPerShareDiluted | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 1.43 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 3.60 us-gaap_EarningsPerShareDiluted | $ 4.32 us-gaap_EarningsPerShareDiluted | $ 4.19 us-gaap_EarningsPerShareDiluted

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