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

X

- 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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X

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X

- Details

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X

- Details

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