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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Harbinger Fund
Other Non-Operating and Non-Recurring Charges [Abstract]
Cost-method investment, OTTI	$ 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember	$ 200,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember
Cost-method investment, OTTI net of tax		100,000tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember
Film Products
Restructuring Cost and Reserve [Line Items]
Pretax charges for severance and other employee-related costs	(67,000)us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	800,000us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures		500,000tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Pretax charges for severance and other employee-related costs		300,000us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Pretax loss for asset impairments		200,000tg_AssetImpairmentandOtherPlantShutdownRelatedCosts / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures	15,000tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
3M vs. Tredegar
Other Non-Operating and Non-Recurring Charges [Abstract]
Litigation Settlement, Amount			$ 10,000,000us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember

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Asset Impairment and Other Plant Shutdown Related Costs

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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