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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total net sales	$ 226,846tg_NetSales	$ 228,443tg_NetSales
Add back freight	7,325us-gaap_ShippingHandlingAndTransportationCosts	6,770us-gaap_ShippingHandlingAndTransportationCosts
Sales as shown in the Consolidated Statements of Income	234,171us-gaap_SalesRevenueGoodsNet	235,213us-gaap_SalesRevenueGoodsNet
Total Segment Income (Loss)	22,961tg_TotalIncomeLossAssociatedWithSegments	20,238tg_TotalIncomeLossAssociatedWithSegments
Interest income	89us-gaap_InvestmentIncomeInterest	195us-gaap_InvestmentIncomeInterest
Interest expense	885us-gaap_InterestAndDebtExpense	630us-gaap_InterestAndDebtExpense
Stock option-based compensation costs	300us-gaap_StockOptionPlanExpense	241us-gaap_StockOptionPlanExpense
Corporate expenses, net	7,216tg_CorporateExpensesNet	6,475tg_CorporateExpensesNet
Income from continuing operations before income taxes	14,649us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,087us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes	4,779us-gaap_IncomeTaxExpenseBenefit	4,608us-gaap_IncomeTaxExpenseBenefit
Net income	9,870us-gaap_NetIncomeLoss	8,479us-gaap_NetIncomeLoss
kaleo
Segment Reporting Information [Line Items]
Income taxes	4us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = tg_KaleoMember	(2,239)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = tg_KaleoMember
Net income	(11,868)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = tg_KaleoMember	(3,519)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = tg_KaleoMember
Film Products
Segment Reporting Information [Line Items]
Total net sales	133,201tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	149,160tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Operating profit from ongoing operations	17,617tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	16,722tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Plant shutdowns, asset impairments, restructurings and other	67tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	(1,245)tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Aluminum Extrusions
Segment Reporting Information [Line Items]
Total net sales	93,645tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember	79,283tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Operating profit from ongoing operations	5,292tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember	4,761tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Plant shutdowns, asset impairments, restructurings and other	$ (15)tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember	$ 0tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember

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