XML 131 R106.htm IDEA: XBRL DOCUMENT v2.4.1.9

Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details) (USD $)	3 Months Ended	12 Months Ended						3 Months Ended											17 Months Ended	6 Months Ended
	Mar. 31, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2012	Jun. 30, 2012	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Aug. 31, 2012 employee
Restructuring Cost and Reserve [Line Items]
Asset impairments		$ 993,000us-gaap_AssetImpairmentCharges		$ 1,639,000us-gaap_AssetImpairmentCharges		$ 2,185,000us-gaap_AssetImpairmentCharges
Unrealized gain (loss) on investments under fair value method		2,000,000us-gaap_UnrealizedGainLossOnInvestments		3,400,000us-gaap_UnrealizedGainLossOnInvestments		16,100,000us-gaap_UnrealizedGainLossOnInvestments
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other	13,800,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItems			3,400,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItems		5,500,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItems
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other After Taxes	9,300,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItemsAfterTax			2,200,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItemsAfterTax		3,600,000tg_LossesAssociatedWithPlantShutdownsAssetImpairmentsRestructuringsUnusualItemsGainsLossesFromSaleOfAssetsOtherItemsAfterTax
Effect of LIFO inventory liquidation on income						2,700,000us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
kaleo
Restructuring Cost and Reserve [Line Items]
Unrealized gain (loss) on investments under fair value method		2,000,000us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember	[1]	3,400,000us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember	[1]	16,100,000us-gaap_UnrealizedGainLossOnInvestments / dei_LegalEntityAxis = tg_KaleoMember	[1]
Unrealized gain (loss) on investments, net of tax		1,000,000tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember		2,200,000tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember		10,200,000tg_UnrealizedGainLossOnInvestmentsNetOfTax / dei_LegalEntityAxis = tg_KaleoMember
Unrealized gain (loss) on investments under fair value method after taxes						10,200,000tg_UnrealizedGainLossOnInvestmentUnderFairValueMethodAfterTaxes / dei_LegalEntityAxis = tg_KaleoMember
Harbinger
Restructuring Cost and Reserve [Line Items]
Unrealized loss on investments under fair value method, other than temporary impairment		800,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember		400,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember		1,100,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember
Unrealized loss on investments under fair value method, other than temporary impairment, after taxes		400,000tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember		300,000tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember		700,000tg_CostMethodInvestmentsOtherThanTemporaryImpairmentNetOfTax / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember
Film Products Manufacturing Facility in Shanghai, China
Restructuring Cost and Reserve [Line Items]
Gain (loss) on sale of equipment								(91,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInShanghaiChinaMember
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax								(91,000)tg_GainLossonDispositionofPropertyPlantandEquipmentNetofTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInShanghaiChinaMember
Alleghany and Bath County, Virginia
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on Disposition of Assets		1,208,000us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember		0us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember		0us-gaap_GainLossOnDispositionOfAssets1 / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember
Gain (Loss) on Sale of Investment Property		0tg_UnrealizedGainLossonInvestmentProperty / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember		1,018,000tg_UnrealizedGainLossonInvestmentProperty / dei_EntityByLocationAxis = tg_AlleghanyandBathCountyVirginiaMember		0tg_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
Film Products Manufacturing Facility in LaGrange, Georgia
Restructuring Cost and Reserve [Line Items]
Asset impairments											800,000us-gaap_AssetImpairmentCharges / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Gain (loss) on sale of equipment									100,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax									73,000tg_GainLossonDispositionofPropertyPlantandEquipmentNetofTax / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Gain on sale of property										1,100,000us-gaap_GainLossOnDispositionOfAssets / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Gain on sale of property after taxes										600,000tg_GainLossOnDispositionOfPropertyAfterTax / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Asset impairments after taxes											500,000tg_AssetImpairmentChargesAfterTaxes / dei_EntityByLocationAxis = tg_FilmsProductsManufacturingFacilityInLagrangeGeorgiaMember
Aluminum Extrusions Manufacturing Facility In Newnan Georgia
Restructuring Cost and Reserve [Line Items]
Expected future environmental costs								85,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	700,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	100,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember		75,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	200,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	1,500,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	100,000us-gaap_EnvironmentalExitCostsAnticipatedCost / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember
Expected future environmental costs after taxes								53,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	400,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	49,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember		46,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	100,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	900,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember	62,000tg_EnvironmentalExitCostsAnticipatedCostAfterTaxes / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInNewnanGeorgiaMember
Facility Closing | Film Products Manufacturing Facility in Red Springs, NC
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures	(500,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(700,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember		(500,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember					100,000tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember			(37,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(300,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(300,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(200,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Plant shutdown related expenditures after taxes	(300,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember								63,000tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember			(23,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(200,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(200,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(83,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Severance and other employee-related costs		400,000us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember												300,000us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Asset Impairment and Other Plant Shutdown Related Costs		300,000tg_AssetImpairmentandOtherPlantShutdownRelatedCosts / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Asset impairments															200,000us-gaap_AssetImpairmentCharges / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Number of employees employed		66dei_EntityNumberOfEmployees / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember							66dei_EntityNumberOfEmployees / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Facility Closing | Aluminum Extrusions Manufacturing Facility In Kentland, Indiana
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures								(400,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(11,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(900,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(1,000,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(20,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(24,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember		(45,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(200,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(800,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(900,000)tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Plant shutdown related expenditures after taxes								(200,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(7,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(500,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(700,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(12,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(15,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember		(28,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(94,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(500,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(500,000)tg_PlantShutdownRelatedExpendituresNetAfterTax / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Severance and other employee-related costs																		1,200,000us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	1,200,000us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Gain (loss) on sale of equipment																		800,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Accelerated depreciation																		2,400,000tg_AcceleratedDepreciation / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	2,400,000tg_AcceleratedDepreciation / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Other shutdown-related charges																		2,300,000tg_OtherShutdownRelatedCharges / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	1,000,000tg_OtherShutdownRelatedCharges / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Effect of LIFO inventory liquidation on income																		1,500,000us-gaap_EffectOfLIFOInventoryLiquidationOnIncome / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Number of employees employed																						146dei_EntityNumberOfEmployees / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Estimated charges related to plant shutdown																			4,500,000tg_EstimatedTotalPlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Cash expenditures related to restructuring charges																			3,500,000tg_PlantShutdownRelatedCashExpendituresNet / dei_EntityByLocationAxis = tg_AluminumExtrusionsManufacturingFacilityInKentlandIndianaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Cash expenditures related to restructuring charges, period of recognition																			18 months
Film Products
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related costs										200,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember	100,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember					100,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Asset impairments										200,000us-gaap_AssetImpairmentCharges / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Severance and other employee-related costs after taxes										100,000tg_SeveranceCostsAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember	46,000tg_SeveranceCostsAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember					67,000tg_SeveranceCostsAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Gain associated with insurance recovery on idle equipment that was destroyed in a fire at outside warehouse										1,300,000tg_GainAssociatedWithInsuranceRecoveryOnIdleEquipment / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Gain associated with insurance recovery on idle equipment that was destroyed in a fire at outside warehouse after taxes										700,000tg_GainAssociatedWithInsuranceRecoveryOnIdleEquipmentAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Asset impairments after taxes										200,000tg_AssetImpairmentChargesAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_FilmProductsMember
Aluminum Extrusions
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related costs														300,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = tg_AluminumExtrusionsMember				200,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = tg_AluminumExtrusionsMember
Severance and other employee-related costs after taxes														200,000tg_SeveranceCostsAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_AluminumExtrusionsMember				100,000tg_SeveranceCostsAfterTaxes / us-gaap_RestructuringCostAndReserveAxis = tg_AluminumExtrusionsMember
AACOA
Restructuring Cost and Reserve [Line Items]
Integration-related expenses and other non-recurring transactions								90,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember		200,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember						100,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Integration-related expenses and other non-recurring transactions after taxes								54,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember		100,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember						63,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Acquisition-related expenses						2,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember				900,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember							300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember			1,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember	800,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Acquisition-related expenses after taxes										600,000tg_AcquisitionRelatedExpensesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember							200,000tg_AcquisitionRelatedExpensesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
AACOA | Aluminum Extrusions
Restructuring Cost and Reserve [Line Items]
Charge associated with purchase accounting adjustements										100,000tg_InventoryFvPurchaseAccountingAdjustmentIncludedInCogs / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember / us-gaap_RestructuringCostAndReserveAxis = tg_AluminumExtrusionsMember
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Terphane
Restructuring Cost and Reserve [Line Items]
Integration-related expenses and other non-recurring transactions										100,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember	600,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember						100,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember	300,000tg_IntegrationExpensesAndOtherNonRecurringCharges / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember
Integration-related expenses and other non-recurring transactions after taxes										100,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember	400,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember						100,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember	200,000tg_IntegrationExpensesAndOtherNonRecurringChargesAfterTaxes / us-gaap_BusinessAcquisitionAxis = tg_TerphaneHoldingsLlcMember
Tredegar vs. 3M [Member]
Restructuring Cost and Reserve [Line Items]
Litigation Settlement, Amount	10,000,000us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember											10,000,000us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember
Litigation Settlement Amount, Net of Tax	6,800,000tg_LitigationSettlementAmountNetofTax / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember
Film Products
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related costs	800,000us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember								500,000us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember			400,000us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	600,000us-gaap_SeveranceCosts1 / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Severance and other employee-related costs after taxes	500,000tg_SeveranceCostsAfterTaxes / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember								300,000tg_SeveranceCostsAfterTaxes / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember			200,000tg_SeveranceCostsAfterTaxes / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember	400,000tg_SeveranceCostsAfterTaxes / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Aluminum Extrusions
Restructuring Cost and Reserve [Line Items]
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Severance and other employee-related costs after taxes												$ 18,000tg_SeveranceCostsAfterTaxes / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
[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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