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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Total long-term debt | $ 386,642 us-gaap_LongTermDebt | $ 404,612 us-gaap_LongTermDebt
Less current portion | (6,885)us-gaap_LongTermDebtCurrent | (5,734)us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion | 379,757 us-gaap_LongTermDebtNoncurrent | 398,878 us-gaap_LongTermDebtNoncurrent
Total long-term debt | 386,642 us-gaap_LongTermDebt | 404,612 us-gaap_LongTermDebt
Revolving Credit Facility, Due Mar. 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 80,030 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = glt_LineOfCreditOneMember |
Total long-term debt | 80,030 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = glt_LineOfCreditOneMember |
Revolving Credit Facility, Due Nov. 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt |  | 90,555 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Total long-term debt |  | 90,555 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
5.375% Notes, Due Oct. 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember
Total long-term debt | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember | 250,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember
2.40% Term Loan, Due Jun. 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 10,742 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember | 12,155 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember
Total long-term debt | 10,742 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember | 12,155 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember
2.05% Term Loan, Due Mar. 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 45,870 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember | 51,902 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember
Total long-term debt | $ 45,870 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember | $ 51,902 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember

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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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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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