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Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail) | Mar. 31, 2015 Cash Flow Hedges [Member] Euro / British Pound [Member] Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] EUR (€) | Dec. 31, 2014 Cash Flow Hedges [Member] Euro / British Pound [Member] Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] EUR (€) | Mar. 31, 2015 Cash Flow Hedges [Member] Euro / Philippine Peso [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] PHP | Dec. 31, 2014 Cash Flow Hedges [Member] Euro / Philippine Peso [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] PHP | Mar. 31, 2015 Cash Flow Hedges [Member] British Pound / Philippine Peso [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] PHP | Dec. 31, 2014 Cash Flow Hedges [Member] British Pound / Philippine Peso [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] PHP | Mar. 31, 2015 Cash Flow Hedges [Member] Euro / U.S. dollar [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] USD ($) | Dec. 31, 2014 Cash Flow Hedges [Member] Euro / U.S. dollar [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] USD ($) | Mar. 31, 2015 Cash Flow Hedges [Member] U.S. Dollar / Canadian Dollar [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] USD ($) | Dec. 31, 2014 Cash Flow Hedges [Member] U.S. Dollar / Canadian Dollar [Member] Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] USD ($) | Dec. 31, 2014 Foreign Currency Hedges [Member] Euro / British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] EUR (€) | Mar. 31, 2015 Foreign Currency Hedges [Member] Euro / U.S. dollar [Member] Not Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] USD ($) | Dec. 31, 2014 Foreign Currency Hedges [Member] U.S Dollar / Euro [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedges [Member] U.S. Dollar / British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] USD ($) | Dec. 31, 2014 Foreign Currency Hedges [Member] U.S. Dollar / British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] USD ($) | Mar. 31, 2015 Foreign Currency Hedges [Member] British Pound / U.S. dollar [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] GBP (£) | Mar. 31, 2015 Foreign Currency Hedges [Member] Euro/ British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Sell Notional [Member] GBP (£) | Mar. 31, 2015 Foreign Currency Hedges [Member] Euro/ British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] EUR (€) | Dec. 31, 2014 Foreign Currency Hedges [Member] Euro/ British Pound [Member] Not Designated as Hedging [Member] Sell/Buy - Buy Notional [Member] EUR (€)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount | € 6,236,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | € 4,592,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 528,553,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroPhilippinePesoMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 523,313,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroPhilippinePesoMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 336,235,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundPhilippinePesoMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 260,535,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundPhilippinePesoMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 41,796,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 32,527,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 12,999,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_UsDollarCanadianDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 10,036,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_UsDollarCanadianDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | € 2,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 3,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 4,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarEuroMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 9,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 9,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | £ 4,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundUSDollarMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | £ 2,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundEuroMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInSellNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 6,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundEuroMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | € 3,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_BritishPoundEuroMember / us-gaap_DerivativeInstrumentRiskAxis = glt_ForeignExchangeContractSellBuyInBuyNotionalMember / 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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