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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | $ 60.4 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | $ 113.5 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension Benefits [Member] | Other Long-Term Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | 102.0 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 148.9 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension Benefits [Member] | Current Liabilities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (2.0)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = glt_CurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (2.3)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = glt_CurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension Benefits [Member] | Other Long-Term Liabilities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (39.6)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (33.1)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (59.8)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | (54.8)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Benefits [Member] | Current Liabilities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (3.7)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = glt_CurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | (4.0)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = glt_CurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Benefits [Member] | Other Long-Term Liabilities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | $ (56.1)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | $ (50.8)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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