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Financial Instruments (Narrative) (Details) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 USD ($) lb | Dec. 31, 2013 lb | Dec. 31, 2014 Aluminum Futures Contracts USD ($) | Dec. 31, 2013 Aluminum Futures Contracts USD ($) | Dec. 31, 2013 Film Products EUR (€)
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  | $ 8.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = tg_AluminumFuturesContractsMember | $ 8.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = tg_AluminumFuturesContractsMember | € 2.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = tg_FilmProductsMember
Weight of aluminum that hedged future purchase of aluminum to meet fixed-price forward sales contract obligations, lbs | 7,800,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass | 8,400,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass |  |  |
Amounts of unrealized after-tax gains on derivative instruments | $ 0.2 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Details
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- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
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