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Retirement Plans And Other Postretirement Benefits (Schedule Of Targeted Allocation Percentage For Pension Plan Assets And Expected Long-Term Rate Of Return On Assets) (Details) | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations | [1]
Expected Long-term Return %, Total for continuing operations | 7.50%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd |
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 32.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember | [1]
Expected Long-term Return %, Total for continuing operations | 5.50%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember |
Large/mid-capitalization equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_LargeMidCapitalizationEquitySecuritiesMember | [1]
Expected Long-term Return %, Total for continuing operations | 8.80%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_LargeMidCapitalizationEquitySecuritiesMember |
Small-capitalization equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 4.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_SmallCapitalizationEquitySecuritiesMember | [1]
Expected Long-term Return %, Total for continuing operations | 9.90%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_SmallCapitalizationEquitySecuritiesMember |
International and emerging market equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 13.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_InternationalAndEmergingMarketEquitySecuritiesMember | [1]
Expected Long-term Return %, Total for continuing operations | 9.80%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_InternationalAndEmergingMarketEquitySecuritiesMember |
Total equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 27.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_TotalEquitySecuritiesMember | [1]
Expected Long-term Return %, Total for continuing operations | 9.40%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_TotalEquitySecuritiesMember |
Private equity and hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target % Composition of Plan Assets, Total for continuing operations | 41.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember | [1]
Expected Long-term Return %, Total for continuing operations | 7.80%tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember |
[1] | Target percentages for the composition of plan assets represents a neutral position within the approved range of allocations for such assets.

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- Definition An assumption as to the rate of return on plan assets at the end of the year that reflects the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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