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Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 T | Mar. 31, 2014 T
Segment Reporting Information [Line Items] |  |
Net sales | $ 417,469,000 us-gaap_SalesRevenueGoodsNet | $ 455,721,000 us-gaap_SalesRevenueGoodsNet
Energy and related sales, net | 2,068,000 glt_EnergyAndRelatedSalesNet | 5,262,000 glt_EnergyAndRelatedSalesNet
Total revenue | 419,537,000 us-gaap_SalesRevenueNet | 460,983,000 us-gaap_SalesRevenueNet
Cost of products sold | 367,429,000 us-gaap_CostOfGoodsSold | 405,943,000 us-gaap_CostOfGoodsSold
Gross profit (loss) | 52,108,000 us-gaap_GrossProfit | 55,040,000 us-gaap_GrossProfit
SG&A | 31,272,000 us-gaap_SellingGeneralAndAdministrativeExpense | 33,551,000 us-gaap_SellingGeneralAndAdministrativeExpense
Gains on dispositions of plant, equipment and timberlands, net | (2,654,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (809,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Total operating income (loss) | 23,490,000 us-gaap_OperatingIncomeLoss | 22,298,000 us-gaap_OperatingIncomeLoss
Non-operating expense | (4,630,000)us-gaap_NonoperatingIncomeExpense | (4,540,000)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes | 18,860,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,758,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Supplementary Data |  |
Net tons sold | 260,700 glt_AmountOfTonsSold | 267,300 glt_AmountOfTonsSold
Depreciation, depletion and amortization | 15,975,000 us-gaap_DepreciationDepletionAndAmortization | 18,615,000 us-gaap_DepreciationDepletionAndAmortization
Capital expenditures | 21,700 us-gaap_PaymentsToAcquireProductiveAssets | 14,400 us-gaap_PaymentsToAcquireProductiveAssets
Composite Fibers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 135,300,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 158,600,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Total revenue | 135,300,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 158,600,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Cost of products sold | 109,000,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 126,000,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Gross profit (loss) | 26,300,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 32,600,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
SG&A | 11,600,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 13,300,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Total operating income (loss) | 14,700,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 19,300,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Income (loss) before income taxes | 14,700,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 19,300,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Supplementary Data |  |
Net tons sold | 38,000 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 40,000 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Depreciation, depletion and amortization | 6,700,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 7,600,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Capital expenditures | 5,900,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 6,000,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Advanced Airlaid Materials [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 62,300,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 71,300,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Total revenue | 62,300,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 71,300,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Cost of products sold | 55,100,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 63,100,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Gross profit (loss) | 7,200,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 8,200,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
SG&A | 1,900,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 2,300,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Total operating income (loss) | 5,300,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 5,900,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Income (loss) before income taxes | 5,300,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 5,900,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Supplementary Data |  |
Net tons sold | 24,100 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 25,100 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Depreciation, depletion and amortization | 2,200,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 2,300,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Capital expenditures | 1,300,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 1,500,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Specialty Papers [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 219,900,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 225,800,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Energy and related sales, net | 2,100,000 glt_EnergyAndRelatedSalesNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 5,300,000 glt_EnergyAndRelatedSalesNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Total revenue | 222,000,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 231,100,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Cost of products sold | 200,400,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 215,000,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Gross profit (loss) | 21,600,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 16,100,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
SG&A | 12,100,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 13,700,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Total operating income (loss) | 9,500,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 2,400,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Income (loss) before income taxes | 9,500,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 2,400,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Supplementary Data |  |
Net tons sold | 198,700 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 202,200 glt_AmountOfTonsSold / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Depreciation, depletion and amortization | 6,600,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 8,300,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Capital expenditures | 13,200,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 6,200,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Other and Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Cost of products sold | 2,900,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,800,000 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Gross profit (loss) | (2,900,000)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1,800,000)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
SG&A | 5,600,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 4,300,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Gains on dispositions of plant, equipment and timberlands, net | (2,700,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (800,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Total operating income (loss) | (5,800,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5,200,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Non-operating expense | (4,600,000)us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4,500,000)us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income (loss) before income taxes | (10,400,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (9,800,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Supplementary Data |  |
Depreciation, depletion and amortization | 500,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 500,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Capital expenditures | $ 1,300,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 800,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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