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Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Foreign Currency Forward Contracts | Designated as Hedging Instrument | Prepaid Expenses And Other [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_PrepaidExpensesAndOtherMember / us-gaap_DerivativeInstrumentRiskAxis = tg_ForeignCurrencyForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ 47us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_PrepaidExpensesAndOtherMember / us-gaap_DerivativeInstrumentRiskAxis = tg_ForeignCurrencyForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Net asset (liability)	0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = tg_PrepaidExpensesAndOtherMember / us-gaap_DerivativeInstrumentRiskAxis = tg_ForeignCurrencyForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	47us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = tg_PrepaidExpensesAndOtherMember / us-gaap_DerivativeInstrumentRiskAxis = tg_ForeignCurrencyForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Aluminum Futures Contracts | Designated as Hedging Instrument | Accrued Expenses
Derivatives, Fair Value [Line Items]
Asset derivatives	82us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	31us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Liability derivatives: Aluminum futures contracts	(318)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	(178)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Net asset (liability)	(236)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	(147)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Aluminum Futures Contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses
Derivatives, Fair Value [Line Items]
Asset derivatives	7us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Liability derivatives: Aluminum futures contracts	$ (7)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 0us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = tg_AccruedExpensesMember / us-gaap_DerivativeInstrumentRiskAxis = tg_AluminumFuturesContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

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- Details

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X

- Details

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