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v3.21.2

Consolidated Balance Sheets (Parenthetical) $ in Thousands | Dec. 31, 2008 USD ($)
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kaleo [Member] |
Cost Method Investments, Original Cost | $ 7,500

X
- Definition Original amount of cost-method investments at the acquisition date. + References No definition available. + Details
Name: | us-gaap_CostMethodInvestmentsOriginalCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=tg_KaleoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |