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Condensed Consolidating Financial Statements - Additional Information (Detail)
Mar. 31, 2015
Oct. 03, 2012
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