XML 62 R44.htm IDEA: XBRL DOCUMENT
v3.19.2

Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 10 Months Ended | 13 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Asset impairments and costs associated with exit and disposal activities, net of adjustments |  | $ 1,075 | $ 468 |  | $ 2,131 | $ 590 |  |  |  |
(Gain)/loss on asset impairments and divestitures |  |  |  |  | 522 | 0 |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  |  |  | (6,600) | (14,000) |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  | (11) | (109) |  |  |  |
Payments for Restructuring |  |  |  |  | 1,200 |  |  |  |  |
Restructuring Reserve |  | 1,012 |  |  | 1,012 |  |  | $ 1,012 |  | $ 776
kaleo |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  | (7,100) | (5,800) |  | (24,182) | (14,000) |  |  |  |
Unrealized Gain Loss On Investments Net Of Tax |  | 5,600 |  |  | 19,900 |  |  |  |  |
Unrealized gain (loss) on investment under fair value method, after taxes |  |  | (4,523) |  |  | 10,900 |  |  |  |
Other Interest and Dividend Income |  |  |  |  | 17,582 |  |  |  |  |
PE Films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Production LIne Start-up and Ramp-up Costs |  | 200 | 600 |  | 400 | 1,500 |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  |  | 500 |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other |  | (1,523) | (1,135) |  | (2,901) | (2,187) |  |  |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other |  | 0 | 0 |  | 0 | 0 |  |  |  |
Aluminum Extrusions |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other |  | (17) | (46) |  | (57) | (99) |  |  |  |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Professional Fees |  | 2,000 |  |  | 2,900 | 300 |  |  |  |
Severance (a) |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  | 677 |  |  |  |  |
Restructuring Reserve |  | 907 |  |  | 907 |  |  | 907 |  | $ 616
Personal Care Materials [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Plant shutdown related expenditures |  | 1,000 |  |  | 1,000 |  |  |  |  |
Film Products Manufacturing Facility In Shanghai, China [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Disposals |  | 100 |  |  | 400 |  |  |  |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs after Taxes |  | 300 |  |  | 500 |  | $ 3,800 |  |  |
Plant shutdown related expenditures |  |  | 700 |  |  | 700 |  |  |  |
Pretax charges for severance and other employee-related costs |  |  | 400 |  |  | 400 |  |  |  |
Accelerated Depreciation Expense |  |  | 100 |  |  | 100 |  |  |  |
Other Restructuring Costs |  |  | $ 200 |  |  | $ 200 |  |  |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  | 300 |  |  | 500 |  |  | $ 3,000 |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Disposals |  | 200 |  |  | 200 |  |  |  |  |
Pretax charges for severance and other employee-related costs |  | 300 |  |  | 300 |  |  |  |  |
Accelerated Depreciation Expense |  | 300 |  |  | 300 |  |  |  |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  |  |  |  |  |  |  | $ 5,000 |
PE Films Personal Care European Operations [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Disposals |  | 300 |  |  | 300 |  |  |  |  |
Pretax charges for severance and other employee-related costs |  | $ 400 |  |  | $ 400 |  |  |  |  |
Personal Care Materials [Member] | Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items | $ 6,500 |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  | $ 500 |  |  |  |  |  |
Personal Care Materials [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated Depreciation Expense |  |  |  |  |  |  |  |  | 1,600 |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  |  |  |  |  | 700 |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 7,600 |
Personal Care Materials [Member] | PE Films Personal Care European Operations [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 1,700 |
Personal Care Materials [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  |  |  |  |  |  | 1,800 |
Other Restructuring Costs |  |  |  |  |  |  |  |  | $ 5,100 |

X
- Definition Depreciation expense that has been accelerated due to a change in useful life associated with restructuring activities. + References No definition available. + Details
Name: | tg_AcceleratedDepreciationExpense
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amounts charged against earnings for incurred and estimated one-time, nonrecurring costs assoicated with asset impariments and exit and disposal activities. + References No definition available. + Details
Name: | tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivitiesimpairmentLine
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Non-Operating and Non-Recurring Charges [Abstract] + References No definition available. + Details
Name: | tg_OtherNonOperatingandNonRecurringChargesAbstract
Namespace Prefix: | tg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other costs associated with plant consolidation project included in "Cost of goods sold" + References No definition available. + Details
Name: | tg_OtherPlantConsolidationExpensesCostofGoodsSold
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Restructuring Costs after Taxes + References No definition available. + Details
Name: | tg_OtherRestructuringCostsafterTaxes
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net incremental expenses that are not considered part of ongoing operations associated with plant shutdown. + References No definition available. + Details
Name: | tg_PlantShutdownRelatedExpendituresNet
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets, goodwill impairment losses and other non-recurring items which are not associated with the ongoing operations of a segment. + References No definition available. + Details
Name: | tg_PlantShutdownsAssetImpairmentsRestructuringAndOther
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Plant Shutdowns, Assets Impairments, Restructurings And Other [Line Items] + References No definition available. + Details
Name: | tg_PlantShutdownsAssetsImpairmentsRestructuringsAndOtherLineItems
Namespace Prefix: | tg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Production LIne Start-up and Ramp-up Costs + References No definition available. + Details
Name: | tg_ProductionLIneStartupandRampupCosts
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Projected Proceeds from Future Sale of Assets + References No definition available. + Details
Name: | tg_ProjectedProceedsfromFutureSaleofAssets
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrealized gain loss on investment under fair value method after taxes. + References No definition available. + Details
Name: | tg_UnrealizedGainLossOnInvestmentUnderFairValueMethodAfterTaxes
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrealized Gain Loss On Investments Net Of Tax. + References No definition available. + Details
Name: | tg_UnrealizedGainLossOnInvestmentsNetOfTax
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after discount, accretion and premium amortization, of interest income and dividend income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.4) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
Name: | us-gaap_OtherInterestAndDividendIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_OtherRestructuringCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=114873831&loc=SL114874205-224268 + Details
Name: | us-gaap_ProfessionalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of restructuring charges, remediation cost, and asset impairment loss. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_RestructuringSettlementAndImpairmentProvisions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_SeveranceCosts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

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

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=tg_PersonalCareMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=tg_FilmProductsManufacturingFacilityInShanghaiChinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=tg_FilmProductsManufacturingFacilityInLakeZurichIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=tg_PEFilmsPersonalCareEuropeanOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=tg_PersonalCareMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=tg_PersonalCareMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |