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Other Income (Expense), Net (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Other Income and Expenses [Abstract] |  |
Other income (expense), net | $ 17,110 | $ 8,233
Other Nonoperating Income (Expense), Net - Other | $ 28 | $ 33

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- Definition Other Nonoperating Income (Expense), Net - Other + 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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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
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