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

X

- 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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X

- 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

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