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Investments (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 02, 2007 | Dec. 31, 2008
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on investment accounted for under the fair value method | $ 2,000,000 us-gaap_UnrealizedGainLossOnInvestments |  | $ 3,400,000 us-gaap_UnrealizedGainLossOnInvestments |  | $ 16,100,000 us-gaap_UnrealizedGainLossOnInvestments |  |  |
kaleo |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Total cash invested in private company |  |  |  |  |  |  |  | 7,500,000 us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes / dei_LegalEntityAxis = tg_KaleoMember
Ownership interest percentage | 20.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |  |  |
Gain (loss) on investment accounted for under the fair value method | 2,000,000 us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember | [1] | 3,400,000 us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember | [1] | 16,100,000 us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember | [1] |  |
Unrealized gain (loss) on investments, net of tax | 1,000,000 tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember |  | 2,200,000 tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember |  | 10,200,000 tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember |  |  |
Weighted average cost of capital | 45.00%tg_FairValueInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesWeightedAverageCostOfCapital / dei_LegalEntityAxis = tg_KaleoMember |  | 55.00%tg_FairValueInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesWeightedAverageCostOfCapital / dei_LegalEntityAxis = tg_KaleoMember |  | 55.00%tg_FairValueInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesWeightedAverageCostOfCapital / dei_LegalEntityAxis = tg_KaleoMember |  |  |
Basis point decrease of weighted average cost of capital assumption | 5.00%tg_PointDecreaseOfWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |  |  |
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption | 6,000,000 tg_IncreaseInFairValueFromFiveHundredPointDecreaseInWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |  |  |
Basis point increase of weighted average cost of capital assumption | 5.00%tg_PointIncreaseOfWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |  |  |
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption | 6,000,000 tg_DecreaseInFairValueFromFiveHundredPointIncreaseInWeightedAverageCostOfCapitalAssumption / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |  |  |
Harbinger |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Total cash invested in private company |  |  |  |  |  |  | 10,000,000 us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |
Unrealized loss on investments under fair value method, other than temporary impairment | 800,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 400,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 1,100,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  |
Unrealized loss on investments, net of tax | 400,000 tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 300,000 tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 700,000 tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  |
Withdrawal proceeds | 200,000 tg_TotalWithdrawalProceedsReceived / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 400,000 tg_TotalWithdrawalProceedsReceived / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 500,000 tg_TotalWithdrawalProceedsReceived / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  |
Maximum | Harbinger |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Percent ownership in investment (less than) |  |  |  |  |  |  | 2.00%tg_PercentOwnershipInInvestment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Other Assets and Deferred Charges [Member] | kaleo |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Carrying value | 39,100,000 us-gaap_InvestmentOwnedAtFairValue / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_KaleoMember |  | 37,100,000 us-gaap_InvestmentOwnedAtFairValue / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_KaleoMember |  |  |  |  |
Other Assets and Deferred Charges [Member] | Harbinger |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Carrying value of investment | 1,800,000 us-gaap_CostMethodInvestments / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  | 2,800,000 us-gaap_CostMethodInvestments / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |  |  |  |  |
Other Assets and Deferred Charges [Member] | Alleghany and Bath County, Virginia |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Carrying value of investment | 2,600,000 us-gaap_CostMethodInvestments / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_AlleghanyandBathCountyVirginiaMember |  | 5,900,000 us-gaap_CostMethodInvestments / us-gaap_BalanceSheetLocationAxis = tg_OtherAssetsandDeferredChargesMember / dei_LegalEntityAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  |  |  |
Alleghany and Bath County, Virginia |  |  |  |  |  |  |  |
Investments, Other Investments [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets | 1,208,000 us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  | 0 us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  | 0 us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  |
Unrealized Gain (Loss) on Investment Property | 0 tg_UnrealizedGainLossonInvestmentProperty / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  | 1,018,000 tg_UnrealizedGainLossonInvestmentProperty / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  | 0 tg_UnrealizedGainLossonInvestmentProperty / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  |
Unrealized Gain Loss On Investment Property After Tax |  |  | (600,000)tg_UnrealizedGainLossOnInvestmentPropertyAfterTax / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  |  |  |
Gain (Loss) on Sale of Investment Property, After Tax | $ (800,000)tg_GainLossonSaleofInvestmentPropertyAfterTax / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember |  |  |  |  |  |  |
[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.

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