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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
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Income Tax Disclosure [Abstract] |  |
Reserves, Current | $ 5,032 glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesCurrent | $ 5,001 glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesCurrent
Compensation, Current | 3,087 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostCurrent | 3,111 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostCurrent
Post-retirement benefits, Current | 1,531 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsCurrent | 1,070 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsCurrent
Intangible Assets, Current | 0 glt_DeferredTaxAssetsIntangibleAssetsCurrent | 0 glt_DeferredTaxAssetsIntangibleAssetsCurrent
Pension, Current | 532 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsCurrent | 802 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsCurrent
Inventories, Current | 2,758 us-gaap_DeferredTaxAssetsInventory | 1,491 us-gaap_DeferredTaxAssetsInventory
Other | (783)glt_DeferredTaxAssetsOtherCurrent | 893 glt_DeferredTaxAssetsOtherCurrent
Tax carryforwards, Current | 8,560 glt_DeferredTaxAssetsTaxCarryforwardsCurrent | 10,322 glt_DeferredTaxAssetsTaxCarryforwardsCurrent
Subtotal, Current | 20,717 us-gaap_DeferredTaxAssetsGrossCurrent | 22,690 us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance, Current | (934)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent | (1,255)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total, Current | 19,783 us-gaap_DeferredTaxAssetsNetCurrent | 21,435 us-gaap_DeferredTaxAssetsNetCurrent
Reserves, Non-current | 7,987 glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesNoncurrent | 7,919 glt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesNoncurrent
Compensation, Non-current | 5,075 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent | 5,000 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent
Post-retirement benefits, Non-current | 21,338 glt_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsNoncurrent | 19,819 glt_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 | 1,171 glt_DeferredTaxAssetsOtherNoncurrent | 2,377 glt_DeferredTaxAssetsOtherNoncurrent
Tax carryforwards, Non-current | 12,660 glt_DeferredTaxAssetsTaxCarryforwardsNonCurrent | 16,922 glt_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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31938-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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