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Other Current Liabilities - Summary of Other Current Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities, Current [Abstract]    
Accrued payroll and benefits $ 39,471us-gaap_AccruedSalariesCurrent $ 41,492us-gaap_AccruedSalariesCurrent
Other accrued compensation and retirement benefits 7,920us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent 8,372us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent
Income taxes payable 3,502us-gaap_AccruedIncomeTaxesCurrent 6,546us-gaap_AccruedIncomeTaxesCurrent
Accrued rebates 18,910glt_AccruedRebates 20,208glt_AccruedRebates
Other accrued expenses 41,274us-gaap_OtherAccruedLiabilitiesCurrent 46,019us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 111,077us-gaap_OtherLiabilitiesCurrent $ 122,637us-gaap_OtherLiabilitiesCurrent