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Summary of Significant Accounting Policies (Schedule of Reclassifications Out of AOCI) (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of goods sold

$ (778,113)us-gaap_CostOfGoodsSold

$ (784,675)us-gaap_CostOfGoodsSold

$ (712,660)us-gaap_CostOfGoodsSold

Income taxes

9,387us-gaap_IncomeTaxExpenseBenefit

^[1]

16,995us-gaap_IncomeTaxExpenseBenefit

^[1]

18,319us-gaap_IncomeTaxExpenseBenefit

^[1]

Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Total, before taxes

647us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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(583)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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Income taxes

244us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
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(221)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

Total, net of tax

403us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

(362)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

Pension and other post-retirement benefit adjustments | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Actuarial gain (loss) and prior service costs, before taxes

(10,579)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

^[2]

(14,818)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

^[2]

Income taxes

(3,582)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

(5,398)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

Total, net of tax

(6,997)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

(9,420)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
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Aluminum Futures Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of goods sold

631us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= tg_AluminumFuturesContractsMember
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(583)us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= tg_AluminumFuturesContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember

Foreign Currency Forward Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of goods sold

$ 16us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
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$ 0us-gaap_CostOfGoodsSold
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[1]	See Notes 1, 3, 4 and 18 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.
[2]	This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 14 for additional detail).

X

- Definition

Total costs related to goods produced and sold during the reporting period.

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-Number 210

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-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a))

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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