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Condensed Consolidating Financial Statements - Additional Information (Detail) | Mar. 31, 2015 | Oct. 03, 2012
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PHG Tea Leaves, Inc. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage owned in domestic subsidiaries | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = glt_PhgTeaLeavesIncMember |
Mollanvick, Inc. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage owned in domestic subsidiaries | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = glt_MollanvickIncMember |
Glatfelter Holdings, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage owned in domestic subsidiaries | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = glt_GlatfelterHoldingsLlcMember |
5.375% Notes [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Interest rate on notes guaranteed | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesMember | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = glt_FivePointThreeSevenFivePercentNotesMember

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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 The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Details
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