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BUSINESS SEGMENTS - Schedule of Net Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Total | $ 159,172 | $ 138,957
United States |  |
Segment Reporting Information [Line Items] |  |
Total | 144,357 | 124,981
Exports From The United States | Asia |  |
Segment Reporting Information [Line Items] |  |
Total | 10,836 | 8,814
Exports From The United States | Latin America |  |
Segment Reporting Information [Line Items] |  |
Total | 1,579 | 1,311
Exports From The United States | Canada |  |
Segment Reporting Information [Line Items] |  |
Total | 2,173 | 3,664
Exports From The United States | Europe |  |
Segment Reporting Information [Line Items] |  |
Total | 7 | 25
Operations outside the United States | Asia |  |
Segment Reporting Information [Line Items] |  |
Total | $ 220 | $ 162

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- Definition Aggregrate revenue during the period from the sales of goods in the normal course of business, after deducting returns, allowances, discounts, and charges for outbound freight. + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |