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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 93,004us-gaap_NetIncomeLoss $ 113,992us-gaap_NetIncomeLoss $ 100,209us-gaap_NetIncomeLoss
OTHER COMPREHENSIVE INCOME (LOSS):      
Foreign currency translation adjustment (26,248)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (31,701)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1,843us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gain (loss) on marketable securities, net of tax benefit 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (8)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized gain (loss) on interest rate swaps:      
Unrealized gain (loss) arising during the period, net of tax benefit (11,153)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 6,112us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (12,724)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment for loss included in interest expense, net of tax provision 7,094us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 6,969us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 7,068us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net unrealized gain (loss) on interest rate swaps, net of tax (4,059)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 13,081us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (5,656)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES (30,307)us-gaap_OtherComprehensiveIncomeLossNetOfTax (18,620)us-gaap_OtherComprehensiveIncomeLossNetOfTax (3,821)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 62,697us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 95,372us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 96,388us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Foreign Currency Transaction Gain (Loss), Unrealized (27,426)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (31,701)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 1,843us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Realized Foreign Transaction Gain Loss $ 1,178gpi_RealizedForeignTransactionGainLoss $ 0gpi_RealizedForeignTransactionGainLoss $ 0gpi_RealizedForeignTransactionGainLoss