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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |
Reclassification from customer relationship intangibles to goodwill | $ 2,900 |
Aluminum Extrusions |  |
Goodwill [Line Items] |  |
Reclassification from customer relationship intangibles to goodwill | $ 2,900 |
Reclassification from customer relationships to goodwill, net amortization |  | $ (900)

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- Definition Reclassification from customer relationship intangibles to goodwill + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reclassification from customer relationships to goodwill, net amortization + References No definition available. + Details
Name: | tg_ReclassificationFromCustomerRelationshipsToGoodwillNetAmortization
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=tg_AluminumExtrusionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |