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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | $ 40,818 us-gaap_DepreciationDepletionAndAmortization | $ 44,655 us-gaap_DepreciationDepletionAndAmortization | $ 49,269 us-gaap_DepreciationDepletionAndAmortization
Capital Expenditures | 44,898 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 79,661 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 33,252 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 40,818 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 44,655 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 49,259 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Capital Expenditures | 44,898 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 79,661 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 33,252 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 10 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Capital Expenditures |  |  | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Film Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 30,730 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 35,332 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 39,202 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Capital Expenditures | 38,806 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 64,867 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember | 30,484 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember
Aluminum Extrusions |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 9,974 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 9,202 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 9,984 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Capital Expenditures | 6,092 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 14,742 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember | 2,332 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember
Subtotal |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 40,704 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember | 44,534 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember | 49,186 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember
Capital Expenditures | 44,898 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember | 79,609 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember | 32,816 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_SubtotalMember
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 114 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember | 121 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember | 73 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember
Capital Expenditures | $ 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember | $ 52 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember | $ 436 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = tg_GeneralCorporateMember

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + 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 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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