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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Line Items]
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards	$ 200,000tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards	$ 40,000tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards
Income Tax Holiday, Income Tax Benefits Per Share		$ 0.01us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Income Tax Holiday, Aggregate Dollar Amount		300,000us-gaap_IncomeTaxHolidayAggregateDollarAmount
Effective Income Tax Rate Reconciliation, Percent	32.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations	35.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Terphane Ltda
Income Taxes [Line Items]
Current Effective Tax Rate Reconciliation Social Contribution On Income		9.00%tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome / dei_LegalEntityAxis = tg_TerphaneLtdaMember
Current Effective Tax Rate Excluding Social Contribution On Income		6.25%tg_CurrentEffectiveTaxRateExcludingSocialContributionOnIncome / dei_LegalEntityAxis = tg_TerphaneLtdaMember
Current Effective Tax Rate Including Social Contribution On Income		15.25%tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome / dei_LegalEntityAxis = tg_TerphaneLtdaMember
Brazil
Income Taxes [Line Items]
Effective income tax rate reconciliation social contribution on income		9.00%tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = country_BR
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income		25.00%tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = country_BR
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income		34.00%tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome / us-gaap_IncomeTaxAuthorityAxis = country_BR
Excess Capital Losses From Investments And Other Related Items [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 11,100,000us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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