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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Taxes [Line Items] |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards | $ 200,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards | $ 40,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards
Income Tax Holiday, Income Tax Benefits Per Share |  | $ 0.01 us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Income Tax Holiday, Aggregate Dollar Amount |  | 300,000 us-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 | $ 11,100,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember |

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- Definition Deferred tax expense (benefit) related to a valuation allowance associated with previously recorded capital losses on certain investments + References No definition available. + Details
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- Definition Effective income tax rate reconciliation social contribution on income. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section C + Details
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