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v2.4.1.9

Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
5.375% Notes, Due Oct. 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturity date | Oct. 31, 2020 |
Interest rate on debt | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesDueOctoberTwoThousandTwentyMember
2.40% Term Loan, Due Jun. 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturity date | Jun. 30, 2022 |
Interest rate on debt | 2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_TwoPointFourZeroPercentTermLoanDueJuneTwoThousandTwentyTwoMember |
2.05% Term Loan, Due Mar. 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturity date | Mar. 31, 2023 |
Interest rate on debt | 2.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember | 2.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_TwoPointZeroFivePercentTermLoanDueMarchTwoThousandTwentyThreeMember
Revolving Credit Facility, Due Nov. 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturity date | Nov. 30, 2016 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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