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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 | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | $ 386,642 us-gaap_LongTermDebt | $ 404,612 us-gaap_LongTermDebt
Fair Value | 395,451 us-gaap_LongTermDebtFairValue | 411,757 us-gaap_LongTermDebtFairValue
Variable Rate Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Value | 80,030 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember | 90,555 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember
Fair Value | 80,030 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_VariableRateDebtMember | 90,555 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 | 256,563 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_FixedRateBondsMember | 255,470 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 | 45,870 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember | 51,902 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember
Fair Value | 47,567 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanMember | 53,106 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 | 10,742 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember | 12,155 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember
Fair Value | $ 11,291 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanMember | $ 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
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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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