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Plant, Equipment and Timberlands - Summary of Plant, Equipment and Timberlands (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (989,093)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ (976,645)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Subtotal	642,184glt_PropertyPlantAndEquipmentNetExcludingConstructionInProgressAssetRetirementObligationTimberLands	669,184glt_PropertyPlantAndEquipmentNetExcludingConstructionInProgressAssetRetirementObligationTimberLands
Construction in progress	49,078us-gaap_ConstructionInProgressGross	47,271us-gaap_ConstructionInProgressGross
Asset retirement obligation, net	3,021us-gaap_CapitalizedCostsAssetRetirementCosts	4,748us-gaap_CapitalizedCostsAssetRetirementCosts
Timberlands, less depletion	3,325us-gaap_TimberAndTimberlands	2,137us-gaap_TimberAndTimberlands
Total	697,608us-gaap_PropertyPlantAndEquipmentNet	723,340us-gaap_PropertyPlantAndEquipmentNet	621,200us-gaap_PropertyPlantAndEquipmentNet
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	208,230us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember	206,891us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,265,317us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember	1,279,264us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Furniture, Fixtures, and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 157,730us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember	$ 159,674us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember

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Property plant and equipment net excluding construction in progress asset retirement obligation timberlands.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount before accumulated depreciation and depletion of forest crops and land devoted primarily to the growth and harvest of forest crops for commercial purposes.

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