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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 ($)
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	£ 4,592invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	€ 9,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_EuroUSDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	€ 2,000invest_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	€ 5,000invest_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	$ 9,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 6,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarBritishPoundMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	2,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_CanadianDollarUsDollarMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	€ 4,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarEuroMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 2,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = glt_USDollarEuroMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = glt_ForeignCurrencyHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

X

- 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

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration