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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	$ 69,246us-gaap_NetIncomeLoss	$ 67,158us-gaap_NetIncomeLoss	$ 59,379us-gaap_NetIncomeLoss
Foreign currency translation adjustments	(49,365)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	14,826us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	11,358us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $(1,281), $178 and $638, respectively	3,297us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	(517)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	(1,609)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Unrecognized retirement obligations, net of taxes of $20,730, $(45,118) and $3,914, respectively	(33,445)glt_OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostUnrecognizedInNetPeriodicPensionCostNetOfTax	74,300glt_OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostUnrecognizedInNetPeriodicPensionCostNetOfTax	(6,974)glt_OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostUnrecognizedInNetPeriodicPensionCostNetOfTax
Other comprehensive income (loss)	(79,513)us-gaap_OtherComprehensiveIncomeLossNetOfTax	88,609us-gaap_OtherComprehensiveIncomeLossNetOfTax	2,775us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive (loss) income	$ (10,267)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ 155,767us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ 62,154us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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Other comprehensive income (loss), amortization, pension and other postretirement benefit plans, net prior service cost unrecognized in net periodic pension cost, net of tax.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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