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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill - Composite Fibers | $ 84,137 us-gaap_Goodwill | $ 95,948 us-gaap_Goodwill
Total intangibles | 95,769 us-gaap_FiniteLivedIntangibleAssetsGross | 109,837 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization | (18,671)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (13,756)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net intangibles | 77,098 us-gaap_IntangibleAssetsNetExcludingGoodwill | 96,081 us-gaap_IntangibleAssetsNetExcludingGoodwill
Specialty Papers [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 6,155 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPaperMember | 6,155 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = glt_SpecialtyPaperMember
Composite Fibers [Member] | Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 5,902 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TradeNameMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 10,325 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TradeNameMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 41,749 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TechnologyAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 46,038 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TechnologyAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Composite Fibers [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 37,421 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_CustomerRelationshipsAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember | 42,251 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_CustomerRelationshipsAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_CompositeFibersMember
Advanced Airlaid Materials [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 1,500 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TechnologyAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialMember | 1,623 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_TechnologyAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialMember
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | $ 3,042 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_CustomerRelationshipsAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialMember | $ 3,445 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = glt_CustomerRelationshipsAndRelatedMember / us-gaap_StatementBusinessSegmentsAxis = glt_AdvancedAirlaidMaterialMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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