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Pension And Other Post-Retirement Benefits (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Amounts Recognized in Balance Sheet | $ 104,800,000 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet | $ 103,800,000 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Other Post-Retirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution to pension plans for continuing operations | 300,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected required contributions |  | 2,400,000 tg_DefinedBenefitPlanEstimatedRequiredFutureEmployerContributionsInCurrentFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Accrued Expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities | $ 600,000 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember | $ 600,000 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember

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- Definition Defined benefit plan estimated required future employer contributions in current fiscal year. + References No definition available. + Details
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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + 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 (c) -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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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