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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2009 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 30,600,000 us-gaap_GoodwillImpairmentLoss |  |  |  |
Goodwill impairment charge, after taxes | 30,600,000 us-gaap_GoodwillImpairmentLossNetOfTax |  |  |  |
Goodwill |  | 169,687,000 us-gaap_Goodwill | 172,788,000 us-gaap_Goodwill | 176,620,000 us-gaap_Goodwill | 165,372,000 us-gaap_Goodwill
Film Products |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | 156,000,000 us-gaap_Goodwill / us-gaap_ProductOrServiceAxis = tg_FilmProductsMember |  |  |
Aluminum Extrusions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 13,700,000 us-gaap_Goodwill / us-gaap_ProductOrServiceAxis = tg_AluminumExtrusionsMember |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount after tax of loss recognized that results from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
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- Details
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- Details
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