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Consolidated Statement of Stockholders' Equity (USD $) In Thousands | Total | Common Stock | Additional Paid-in-Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | 3.00% Convertible Notes [Member] | 3.00% Convertible Notes [Member] Additional Paid-in-Capital | 2.25% Convertible Notes [Member] | 2.25% Convertible Notes [Member] Additional Paid-in-Capital | 2.25% Convertible Notes [Member] Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 | $ 807,100 us-gaap_StockholdersEquity | $ 260 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 363,375 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 591,037 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (29,236)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (118,336)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Beginning balance, shares at Dec. 31, 2011 |  | 25,967 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Net income (loss) | 100,209 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net | (3,821)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  | (3,821)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  |
Equity component of 3.00% Convertible Note issuance, net of deferred tax liability | (32,505)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  | (32,505)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common and treasury shares to employee benefit plans, shares |  | (131)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlansShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Issuance of common and treasury shares to employee benefit plans | (915)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans | (2)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (12,949)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 12,036 gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Tax effect from options exercised and the vesting of restricted shares | 3,035 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 3,035 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Purchases of treasury stock | (11,317)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (11,317)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Stock-based compensation | 11,880 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 11,880 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Cash dividends | (13,382)us-gaap_DividendsCommonStockCash |  |  | (13,382)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2012 | 860,284 us-gaap_StockholdersEquity | 258 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 332,836 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 677,864 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (33,057)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (117,617)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Ending balance, shares at Dec. 31, 2012 |  | 25,836 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Net income (loss) | 113,992 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net | (18,620)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  | (18,620)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  |
Equity component of 3.00% Convertible Note issuance, net of deferred tax liability | 3,411 us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  | 3,411 us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common and treasury shares to employee benefit plans, shares |  | (90)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlansShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Issuance of common and treasury shares to employee benefit plans | (1,823)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans | (1)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (12,137)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 10,315 gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Tax effect from options exercised and the vesting of restricted shares | 2,993 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 2,993 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Purchases of treasury stock | (3,554)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (3,554)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Treasury stock used in acquisition | 80,398 gpi_Treasurystockusedinacquisition |  | 27,689 gpi_Treasurystockusedinacquisition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 52,709 gpi_Treasurystockusedinacquisition / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
TEMPORARY EQUITY - redeemable equity portion of the 3.00% Convertible Senior Notes | (29,094)us-gaap_TemporaryEquityCarryingAmountAttributableToParent |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 13,849 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 13,849 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Cash dividends | (15,755)us-gaap_DividendsCommonStockCash |  |  | (15,755)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | 1,035,175 us-gaap_StockholdersEquity | 257 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 368,641 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 776,101 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (51,677)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (58,147)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Ending balance, shares at Dec. 31, 2013 |  | 25,746 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Net income (loss) | 93,004 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net | (30,307)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  | (30,307)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  |
Equity component of 3.00% Convertible Note issuance, net of deferred tax liability | (14,163)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  | (14,163)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments |  |  |  |  |  |  | (118,044)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / gpi_ConvertibleDebtAxis = gpi_A3.00ConvertibleNotesMember | (118,044)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / gpi_ConvertibleDebtAxis = gpi_A3.00ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (16,071)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember | 20,789 us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock Issued During Period, Value, Conversion of Convertible Securities |  |  |  |  |  |  |  |  |  |  | 36,860 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Call Options and Warrant Equity Settlement | 32,641 gpi_CallOptionsandWarrantEquitySettlement |  |  |  |  |  |  | 32,641 gpi_CallOptionsandWarrantEquitySettlement / gpi_ConvertibleDebtAxis = gpi_A3.00ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 gpi_CallOptionsandWarrantEquitySettlement / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember | 33,772 gpi_CallOptionsandWarrantEquitySettlement / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (33,772)gpi_CallOptionsandWarrantEquitySettlement / gpi_ConvertibleDebtAxis = gpi_A2.25ConvertibleNotesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of common and treasury shares to employee benefit plans, shares |  | (22)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlansShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Issuance of common and treasury shares to employee benefit plans | (321)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans | 0 gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (13,008)gpi_IssuanceOfCommonAndTreasurySharesToEmployeeBenefitPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Net Issuance of Common and Treasury Shares to Employee Stock Compensation Plans |  |  |  |  |  | 12,687 gpi_NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Tax effect from options exercised and the vesting of restricted shares | 1,841 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 1,841 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Purchases of treasury stock | (36,802)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (36,802)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
TEMPORARY EQUITY - redeemable equity portion of the 3.00% Convertible Senior Notes | 0 us-gaap_TemporaryEquityCarryingAmountAttributableToParent |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 15,963 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 15,963 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Cash dividends | (17,048)us-gaap_DividendsCommonStockCash |  |  | (17,048)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | $ 978,010 us-gaap_StockholdersEquity | $ 257 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 286,854 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 852,057 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (81,984)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (79,174)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Ending balance, shares at Dec. 31, 2014 |  | 25,724 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The gross value of stock issued during the period upon the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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