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Retirement Plans And Other Postretirement Benefits (Schedule Of Percentage Composition Of Assets Held By Pension Plans) (Details) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 14.50%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember | 14.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember | 14.70%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember
Large/mid-capitalization equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 13.70%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_LargeMidCapitalizationEquitySecuritiesMember | 13.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_LargeMidCapitalizationEquitySecuritiesMember | 10.90%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_LargeMidCapitalizationEquitySecuritiesMember
Small-capitalization equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 4.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_SmallCapitalizationEquitySecuritiesMember | 4.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_SmallCapitalizationEquitySecuritiesMember | 5.40%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_SmallCapitalizationEquitySecuritiesMember
International and emerging market equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_InternationalAndEmergingMarketEquitySecuritiesMember | 11.70%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_InternationalAndEmergingMarketEquitySecuritiesMember | 10.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_InternationalAndEmergingMarketEquitySecuritiesMember
Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 29.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_TotalEquitySecuritiesMember | 30.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_TotalEquitySecuritiesMember | 26.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_TotalEquitySecuritiesMember
Private equity and hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 51.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember | 48.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember | 50.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Composition of Plan Assets at December 31, Total for continuing operations | 5.30%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherAssetsMember | 7.40%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherAssetsMember | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherAssetsMember

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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