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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 | $ 226,846 tg_NetSales | $ 228,443 tg_NetSales
Add back freight | 7,325 us-gaap_ShippingHandlingAndTransportationCosts | 6,770 us-gaap_ShippingHandlingAndTransportationCosts
Sales as shown in the Consolidated Statements of Income | 234,171 us-gaap_SalesRevenueGoodsNet | 235,213 us-gaap_SalesRevenueGoodsNet
Total Segment Income (Loss) | 22,961 tg_TotalIncomeLossAssociatedWithSegments | 20,238 tg_TotalIncomeLossAssociatedWithSegments
Interest income | 89 us-gaap_InvestmentIncomeInterest | 195 us-gaap_InvestmentIncomeInterest
Interest expense | 885 us-gaap_InterestAndDebtExpense | 630 us-gaap_InterestAndDebtExpense
Stock option-based compensation costs | 300 us-gaap_StockOptionPlanExpense | 241 us-gaap_StockOptionPlanExpense
Corporate expenses, net | 7,216 tg_CorporateExpensesNet | 6,475 tg_CorporateExpensesNet
Income from continuing operations before income taxes | 14,649 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 13,087 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes | 4,779 us-gaap_IncomeTaxExpenseBenefit | 4,608 us-gaap_IncomeTaxExpenseBenefit
Net income | 9,870 us-gaap_NetIncomeLoss | 8,479 us-gaap_NetIncomeLoss
kaleo |  |
Segment Reporting Information [Line Items] |  |
Income taxes | 4 us-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 | 133,201 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 149,160 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Operating profit from ongoing operations | 17,617 tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 16,722 tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Plant shutdowns, asset impairments, restructurings and other | 67 tg_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 | 93,645 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 79,283 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Operating profit from ongoing operations | 5,292 tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 4,761 tg_IncomeLossFromOngoingOperations / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Plant shutdowns, asset impairments, restructurings and other | $ (15)tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | $ 0 tg_PlantShutdownsAssetImpairmentsRestructuringAndOther / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember

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- Definition Operating income for the period associated with the ongoing operations of the segment and excluding gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets and other items and goodwill impairment charges. + References No definition available. + Details
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- Definition Aggregrate revenue during the period from the sales of goods in the normal course of business, after deducting returns, allowances, discounts, and charges for outbound freight. + References No definition available. + Details
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- Definition Gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets, goodwill impairment losses and other non-recurring items which are not associated with the ongoing operations of a segment. + References No definition available. + Details
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- Definition Total income and loss before income expenses associated with a specific segment. Includes income/loss from ongoing operations; plant shutdowns, asset impairments, restructurings and other non-recurring charges; and goodwill impairment charges. + References No definition available. + Details
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