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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
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

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