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Quarterly Results - Impact of Certain Factors on Income (Loss) and Earning (Loss) Per Share (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |
Asset Impairment Charge |  | $ (2,356)us-gaap_ImpairmentChargeOnReclassifiedAssets |  |  |  |  |  |
Restructuring Costs & Workforce Efficiency | (373)us-gaap_RestructuringCosts |  |  |  | (60)us-gaap_RestructuringCosts | (117)us-gaap_RestructuringCosts | (193)us-gaap_RestructuringCosts | (260)us-gaap_RestructuringCosts
Alternative Fuel Mixture/Cellulosic Biofuel Credits | 81 glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit | 1,032 glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit |  |  | 450 glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit | 9,866 glt_IncomeTaxExpenseBenefitRelatedToCellulosicBiofuelAndAlternativeFuelMixtureCredit |  |
Gains on Sale of Plant Equipment and Timberlands | 612 us-gaap_GainsLossesOnSalesOfAssets | 1,004 us-gaap_GainsLossesOnSalesOfAssets | 872 us-gaap_GainsLossesOnSalesOfAssets | 507 us-gaap_GainsLossesOnSalesOfAssets | 1,301 us-gaap_GainsLossesOnSalesOfAssets | 142 us-gaap_GainsLossesOnSalesOfAssets |  | 282 us-gaap_GainsLossesOnSalesOfAssets
Acquisition Integration Costs | $ (487)us-gaap_DerivativeGainLossOnDerivativeNet | $ (115)us-gaap_DerivativeGainLossOnDerivativeNet |  |  | $ (194)us-gaap_DerivativeGainLossOnDerivativeNet | $ (154)us-gaap_DerivativeGainLossOnDerivativeNet | $ (3,969)us-gaap_DerivativeGainLossOnDerivativeNet | $ (1,761)us-gaap_DerivativeGainLossOnDerivativeNet

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- Definition The amount of tax benefit or (expense) related to cellulosic biofuel or alternative fuel mixture credits. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets utilized in financial service operations. + References No definition available. + Details
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- Definition For the asset that is reclassified back to held and used from held-for-sale, the amount of impairment charge that is recognized on the reclassification date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2459-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 44 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1756-110224 + Details
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- Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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