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Income Taxes (Summary of Effective Income Tax Rate For Continuing Operations) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax expense at federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal income tax benefit 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax contingency accruals and tax settlements 2.00%tg_EffectiveIncomeTaxRateReconciliationTaxContingencyAccrualsAndTaxSettlements 2.00%tg_EffectiveIncomeTaxRateReconciliationTaxContingencyAccrualsAndTaxSettlements (0.50%)tg_EffectiveIncomeTaxRateReconciliationTaxContingencyAccrualsAndTaxSettlements
Non-deductible expenses 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Foreign rate differences (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax incentive (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (7.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Valuation allowance for foreign operating loss carry-forwards (0.40%)tg_EffectiveIncomeTaxRateReconciliationOperatingLossCarryforwardsValuationAllowanceForForeignCountry 0.50%tg_EffectiveIncomeTaxRateReconciliationOperatingLossCarryforwardsValuationAllowanceForForeignCountry (0.10%)tg_EffectiveIncomeTaxRateReconciliationOperatingLossCarryforwardsValuationAllowanceForForeignCountry
Research and development tax credit (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Domestic Production Activities Deduction (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Changes in estimates related to prior year tax provision (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Unremitted earnings from foreign operations (3.80%)tg_EffectiveIncomeTaxRateReconciliationUnremittedEarningsFromForeignOperations 0.90%tg_EffectiveIncomeTaxRateReconciliationUnremittedEarningsFromForeignOperations 0.60%tg_EffectiveIncomeTaxRateReconciliationUnremittedEarningsFromForeignOperations
Valuation allowance for capital loss carry-forwards (10.20%)tg_EffectiveIncomeTaxRateReconciliationCapitalLossCarryforwardsValuationAllowance 0.80%tg_EffectiveIncomeTaxRateReconciliationCapitalLossCarryforwardsValuationAllowance 1.90%tg_EffectiveIncomeTaxRateReconciliationCapitalLossCarryforwardsValuationAllowance
Other 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate for continuing operations 20.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations