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Income Taxes (Schedule Of Effective Income Tax Rate For Continuing Operations) (Details)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Income tax expense at federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal income tax benefit 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Income tax contingency accruals and tax settlements 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Unremitted earnings from foreign operations 1.00%tg_EffectiveIncomeTaxRateReconciliationUnremittedEarningsFromForeignOperations 1.10%tg_EffectiveIncomeTaxRateReconciliationUnremittedEarningsFromForeignOperations
Changes in estimates related to prior year tax provision (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Non-deductible expenses 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Valuation allowance for foreign operating loss carry-forwards (0.40%)tg_EffectiveIncomeTaxRateReconciliationOperatingLossCarryforwardsValuationAllowanceForForeignCountry (0.40%)tg_EffectiveIncomeTaxRateReconciliationOperatingLossCarryforwardsValuationAllowanceForForeignCountry
Foreign rate differences (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Foreign tax incentives 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Valuation allowance for capital loss carry-forwards (1.60%)tg_EffectiveIncomeTaxRateReconciliationCapitalLossCarryforwardsValuationAllowance 0.30%tg_EffectiveIncomeTaxRateReconciliationCapitalLossCarryforwardsValuationAllowance
Domestic production activities deduction (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Other 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate for income from continuing operations 32.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations