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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 404,612us-gaap_LongTermDebt	$ 442,325us-gaap_LongTermDebt
Less current portion	(5,734)us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion	398,878us-gaap_LongTermDebtNoncurrent	442,325us-gaap_LongTermDebtNoncurrent
Total long-term debt	404,612us-gaap_LongTermDebt	442,325us-gaap_LongTermDebt
5.375% Notes, Due Oct. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember
Total long-term debt	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember	250,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember
2.40% Term Loan, Due Jun. 2022 [Member]
Debt Instrument [Line Items]
Total long-term debt	12,155us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember
Total long-term debt	12,155us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	51,902us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember	58,785us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember
Total long-term debt	51,902us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember	58,785us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember
Revolving Credit Facility, Due Nov. 2016 [Member]
Debt Instrument [Line Items]
Total long-term debt	90,555us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember	133,540us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Total long-term debt	$ 90,555us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember	$ 133,540us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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