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Income Taxes - Schedule of Current and Non-Current Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Reserves, Current	$ 5,032glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesCurrent	$ 5,001glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesCurrent
Compensation, Current	3,087glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostCurrent	3,111glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostCurrent
Post-retirement benefits, Current	1,531glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsCurrent	1,070glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsCurrent
Intangible Assets, Current	0glt_DeferredTaxAssetsIntangibleAssetsCurrent	0glt_DeferredTaxAssetsIntangibleAssetsCurrent
Pension, Current	532glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsCurrent	802glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsCurrent
Inventories, Current	2,758us-gaap_DeferredTaxAssetsInventory	1,491us-gaap_DeferredTaxAssetsInventory
Other	(783)glt_DeferredTaxAssetsOtherCurrent	893glt_DeferredTaxAssetsOtherCurrent
Tax carryforwards, Current	8,560glt_DeferredTaxAssetsTaxCarryforwardsCurrent	10,322glt_DeferredTaxAssetsTaxCarryforwardsCurrent
Subtotal, Current	20,717us-gaap_DeferredTaxAssetsGrossCurrent	22,690us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance, Current	(934)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent	(1,255)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total, Current	19,783us-gaap_DeferredTaxAssetsNetCurrent	21,435us-gaap_DeferredTaxAssetsNetCurrent
Reserves, Non-current	7,987glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesNoncurrent	7,919glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesNoncurrent
Compensation, Non-current	5,075glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent	5,000glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent
Post-retirement benefits, Non-current	21,338glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsNoncurrent	19,819glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsNoncurrent
Property, Non-current	(89,432)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	(98,889)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Intangible Assets, Non-current	(21,285)glt_DeferredTaxAssetsIntangibleAssetsNoncurrent	(28,918)glt_DeferredTaxAssetsIntangibleAssetsNoncurrent
Pension, Non-current	(30,412)glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsNoncurrent	(51,148)glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsNoncurrent
Other, Non-current	1,171glt_DeferredTaxAssetsOtherNoncurrent	2,377glt_DeferredTaxAssetsOtherNoncurrent
Tax carryforwards, Non-current	12,660glt_DeferredTaxAssetsTaxCarryforwardsNonCurrent	16,922glt_DeferredTaxAssetsTaxCarryforwardsNonCurrent
Subtotal, Non-current	(92,898)us-gaap_DeferredTaxAssetsGrossNoncurrent	(126,918)us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance, Non-current	(2,288)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent	(4,905)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total, Non-current	$ (95,186)us-gaap_DeferredTaxAssetsNetNoncurrent	$ (131,823)us-gaap_DeferredTaxAssetsNetNoncurrent

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