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Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | $ 404,612 us-gaap_LongTermDebt | $ 442,325 us-gaap_LongTermDebt
Fair Value | 411,757 us-gaap_LongTermDebtFairValue | 446,025 us-gaap_LongTermDebtFairValue
Variable Rate Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | 90,555 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember | 133,540 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember
Fair Value | 90,555 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember | 133,540 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember
Fixed-Rate Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember
Fair Value | 255,470 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember | 254,533 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember
2.05% Term Loan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | 51,902 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember | 58,785 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember
Fair Value | 53,106 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember | 57,952 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember
2.40% Term Loan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | 12,155 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember |
Fair Value | $ 12,626 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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