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Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail) In Thousands, unless otherwise specified | Dec. 31, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / U.S. Dollar [Member] USD ($) | Dec. 31, 2013 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / U.S. Dollar [Member] USD ($) | Dec. 31, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] U.S. Dollar / Canadian Dollar [Member] CAD | Dec. 31, 2013 Cash Flow Hedges [Member] Designated as Hedging [Member] U.S. Dollar / Canadian Dollar [Member] CAD | Dec. 31, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / Philippine Peso [Member] PHP | Dec. 31, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] British Pound / Philippine Peso [Member] PHP | Dec. 31, 2014 Cash Flow Hedges [Member] Designated as Hedging [Member] Euro / British Pound [Member] GBP (£) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / U.S. Dollar [Member] EUR (€) | Dec. 31, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] EUR (€) | Dec. 31, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] GBP (£) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] EUR (€) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Euro / British Pound [Member] GBP (£) | Dec. 31, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S. Dollar / British Pound [Member] USD ($) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S. Dollar / British Pound [Member] USD ($) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] Canadian Dollar / U.S Dollar [Member] CAD | Dec. 31, 2014 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S Dollar / Euro [Member] EUR (€) | Dec. 31, 2013 Foreign Currency Hedges [Member] Not Designated as Hedging [Member] U.S Dollar / Euro [Member] USD ($)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sell (Buy) Notional | $ (32,527)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ (27,105)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (10,036)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_UsDollarCanadianDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (13,077)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_UsDollarCanadianDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (523,313)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroPhilippinePesoMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (260,535)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundPhilippinePesoMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | £ 4,592 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | € 9,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 2,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | £ (3,000)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 5,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | £ (8,000)invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 9,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 6,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_CanadianDollarUsDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 4,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarEuroMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 2,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarEuroMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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