XML 43 R87.htm IDEA: XBRL DOCUMENT v2.4.1.9
Retirement Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Percentage of change in health care cost trend rate assumptions would be immaterial 1.00%tg_PercentageOfChangeInHealthCareCostTrendRateAssumptionsWouldBeImmaterial    
Expected pension expense for next twelve months $ 12,300,000tg_DefinedBenefitPlanExpectedFuturePensionExpenseNextTwelveMonths    
Term of estimated benefit payments for fixed income securities, minimum 1 year    
Term of estimated benefit payments for fixed income securities, maximum 2 years    
Defined benefit, average remaining duration of benefit payments for pension plans 12 years 8 months 12 days    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expect to required contributions 2,400,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Unfunded Non-Qualified Supplemental Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation to unfunded plan 2,400,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_MultiemployerPlanTypeAxis
= tg_UnfundedNonQualifiedSupplementalPensionPlanMember
2,400,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_MultiemployerPlanTypeAxis
= tg_UnfundedNonQualifiedSupplementalPensionPlanMember
 
Pension Expense 100,000us-gaap_PensionExpense
/ us-gaap_MultiemployerPlanTypeAxis
= tg_UnfundedNonQualifiedSupplementalPensionPlanMember
100,000us-gaap_PensionExpense
/ us-gaap_MultiemployerPlanTypeAxis
= tg_UnfundedNonQualifiedSupplementalPensionPlanMember
100,000us-gaap_PensionExpense
/ us-gaap_MultiemployerPlanTypeAxis
= tg_UnfundedNonQualifiedSupplementalPensionPlanMember
Films Manufacturing Facility In Kerkrade | Multiemployer Plans, Pension      
Defined Benefit Plan Disclosure [Line Items]      
Number of employees participating in pension plan 81tg_NumberOfEmployeesParticipatingInPensionPlan
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_StatementBusinessSegmentsAxis
= tg_FilmsManufacturingFacilityInKerkradeMember
   
Multi-employer pension plan, pension expenses $ 500,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_StatementBusinessSegmentsAxis
= tg_FilmsManufacturingFacilityInKerkradeMember
$ 500,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_StatementBusinessSegmentsAxis
= tg_FilmsManufacturingFacilityInKerkradeMember
$ 500,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_StatementBusinessSegmentsAxis
= tg_FilmsManufacturingFacilityInKerkradeMember