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Segment and Geographic Information - Schedule of Segment Reporting Information of Revenue by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 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 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 436,261 us-gaap_SalesRevenueGoodsNet | $ 465,092 us-gaap_SalesRevenueGoodsNet | $ 445,341 us-gaap_SalesRevenueGoodsNet | $ 455,721 us-gaap_SalesRevenueGoodsNet | $ 434,811 us-gaap_SalesRevenueGoodsNet | $ 456,648 us-gaap_SalesRevenueGoodsNet | $ 425,967 us-gaap_SalesRevenueGoodsNet | $ 405,189 us-gaap_SalesRevenueGoodsNet | $ 1,802,415 us-gaap_SalesRevenueGoodsNet | $ 1,722,615 us-gaap_SalesRevenueGoodsNet | $ 1,577,788 us-gaap_SalesRevenueGoodsNet
Composite Fibers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 617,851 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 566,360 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 436,740 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Food & Beverage [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 296,304 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FoodAndBeverageMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 302,738 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FoodAndBeverageMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 265,423 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FoodAndBeverageMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Wall Covering [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 149,957 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_WallCoveringMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 97,698 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_WallCoveringMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember |
Composite Fibers [Member] | Metallized [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 80,839 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_MetallizedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 83,949 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_MetallizedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 87,720 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_MetallizedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Composite Laminates [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 38,159 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CompositeLaminatesMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 39,296 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CompositeLaminatesMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 44,613 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CompositeLaminatesMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Technical Specialties and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 52,592 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_TechnicalSpecialtiesAndOtherMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 42,679 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_TechnicalSpecialtiesAndOtherMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 38,984 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_TechnicalSpecialtiesAndOtherMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Advanced Airlaid Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 281,673 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 268,396 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 246,282 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Advanced Airlaid Materials [Member] | Feminine Hygiene [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 216,836 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FeminineHygieneMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 219,222 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FeminineHygieneMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 197,792 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_FeminineHygieneMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Advanced Airlaid Materials [Member] | Wipes [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,002 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_WipesMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 15,186 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_WipesMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 13,562 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_WipesMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Advanced Airlaid Materials [Member] | Home Care [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 15,401 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_HomeCareMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 14,857 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_HomeCareMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 14,527 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_HomeCareMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Advanced Airlaid Materials [Member] | Adult Incontinence [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 17,586 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_AdultIncontinenceMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 5,046 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_AdultIncontinenceMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 6,959 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_AdultIncontinenceMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Advanced Airlaid Materials [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 15,848 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 14,085 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember | 13,442 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialsMember
Specialty Papers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 902,891 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 887,859 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 894,777 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Specialty Papers [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,805 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 4,346 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 3,397 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_OtherProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Specialty Papers [Member] | Carbonless & Forms [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 376,959 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CarbonlessAndFormsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 369,618 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CarbonlessAndFormsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 372,950 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_CarbonlessAndFormsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Specialty Papers [Member] | Engineered Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 194,189 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EngineeredProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 184,913 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EngineeredProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 187,724 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EngineeredProductsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Specialty Papers [Member] | Envelope & Converting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 183,194 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EnvelopeAndConvertingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 175,928 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EnvelopeAndConvertingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | 174,781 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_EnvelopeAndConvertingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember
Specialty Papers [Member] | Book Publishing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 144,744 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_BookPublishingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | $ 153,054 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_BookPublishingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember | $ 155,925 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = glt_BookPublishingMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPapersMember

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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