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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards | $ 4,800,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards | $ 4,900,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards |  |
Deferred Tax Benefit Expense Unremitted Earnings FCTA |  | 2,200,000 tg_DeferredTaxBenefitExpenseUnremittedEarningsFCTA |  |
Deferred Tax Expense Benefit Unremitted Earnings FCTA Out of Period Adj |  | 1,700,000 tg_DeferredTaxExpenseBenefitUnremittedEarningsFCTAOutofPeriodAdj |  |
Benefit from the tax incentives |  | 100,000 us-gaap_IncomeTaxHolidayAggregateDollarAmount | 2,500,000 us-gaap_IncomeTaxHolidayAggregateDollarAmount | 4,300,000 us-gaap_IncomeTaxHolidayAggregateDollarAmount
Benefit from the tax incentives, per share |  | $ 0.00 us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare | $ 0.08 us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare | $ 0.13 us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Valuation allowance | 14,577,000 us-gaap_DeferredTaxAssetsValuationAllowance | 14,577,000 us-gaap_DeferredTaxAssetsValuationAllowance | 20,019,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Balance of unrecognized state tax positions | 1,400,000 tg_UnrecognizedStatePositionsExpectedToReverseFromStatuteOfLimitationsLapseNextTwelveMonths | 1,400,000 tg_UnrecognizedStatePositionsExpectedToReverseFromStatuteOfLimitationsLapseNextTwelveMonths |  |
State And Foreign Net Operating Loss Carryforwards |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards | 3,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_StateAndForeignNetOperatingLossCarryforwardsMember | 3,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_StateAndForeignNetOperatingLossCarryforwardsMember |  |
Valuation allowance | 2,800,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_StateAndForeignNetOperatingLossCarryforwardsMember | 2,800,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_StateAndForeignNetOperatingLossCarryforwardsMember | 1,700,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_StateAndForeignNetOperatingLossCarryforwardsMember |
Excess Capital Losses From Investments And Other Related Items |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance | 16,400,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember | 16,400,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember | 11,400,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember |
Asset Impairments In Foreign Jurisdictions |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 400,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_AssetImpairmentsInForeignJurisdictionsMember | $ 400,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_AssetImpairmentsInForeignJurisdictionsMember | $ 1,900,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_AssetImpairmentsInForeignJurisdictionsMember |
Terphane Ltda |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax rate |  | 6.25%tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome / tg_IncomeTaxBeneficiaryAxis = tg_TerphaneLtdaMember |  |
Current effective tax rate |  | 15.25%tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome / tg_IncomeTaxBeneficiaryAxis = tg_TerphaneLtdaMember |  |
Percentage of social contribution on income included in current effective tax rate |  | 9.00%tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome / tg_IncomeTaxBeneficiaryAxis = tg_TerphaneLtdaMember |  |
Brazilian |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate |  | 34.00%tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = tg_BrazilianMember |  |
Income tax rate |  | 25.00%tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = tg_BrazilianMember |  |
Percentage of social contribution on income included in federal statutory income tax rate |  | 9.00%tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = tg_BrazilianMember |  |
Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net Operating Loss Carrforward Expiration Period |  | 5 years |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net Operating Loss Carrforward Expiration Period |  | 8 years |  |

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