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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014
Harbinger Fund |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |
Cost-method investment, OTTI | $ 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember | $ 200,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / dei_LegalEntityAxis = tg_HarbingerCapitalPartnersSpecialSituationsFundLPMember |
Cost-method investment, OTTI net of tax |  | 100,000 tg_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 | 800,000 us-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 |  | 500,000 tg_PlantShutdownRelatedExpendituresNet / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |
Pretax charges for severance and other employee-related costs |  | 300,000 us-gaap_SeveranceCosts1 / dei_EntityByLocationAxis = tg_FilmProductsManufacturingFacilityInRedSpringsNorthCarolinaMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |
Pretax loss for asset impairments |  | 200,000 tg_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 | 15,000 tg_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 |  |  | $ 10,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tg_Tredegarvs.3MMember

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- Definition Net incremental expenses that are not considered part of ongoing operations associated with plant shutdown. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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