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Retirement Plans And Other Postretirement Benefits (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of change in health care cost trend rate assumptions would be immaterial | 1.00%tg_PercentageOfChangeInHealthCareCostTrendRateAssumptionsWouldBeImmaterial |  |
Expected pension expense for next twelve months | $ 12,300,000 tg_DefinedBenefitPlanExpectedFuturePensionExpenseNextTwelveMonths |  |
Term of estimated benefit payments for fixed income securities, minimum | 1 year |  |
Term of estimated benefit payments for fixed income securities, maximum | 2 years |  |
Defined benefit, average remaining duration of benefit payments for pension plans | 12 years 8 months 12 days |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expect to required contributions | 2,400,000 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_MultiemployerPlanTypeAxis = us-gaap_PensionPlansDefinedBenefitMember |  |
Unfunded Non-Qualified Supplemental Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation to unfunded plan | 2,400,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_MultiemployerPlanTypeAxis = tg_UnfundedNonQualifiedSupplementalPensionPlanMember | 2,400,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_MultiemployerPlanTypeAxis = tg_UnfundedNonQualifiedSupplementalPensionPlanMember |
Pension Expense | 100,000 us-gaap_PensionExpense / us-gaap_MultiemployerPlanTypeAxis = tg_UnfundedNonQualifiedSupplementalPensionPlanMember | 100,000 us-gaap_PensionExpense / us-gaap_MultiemployerPlanTypeAxis = tg_UnfundedNonQualifiedSupplementalPensionPlanMember | 100,000 us-gaap_PensionExpense / us-gaap_MultiemployerPlanTypeAxis = tg_UnfundedNonQualifiedSupplementalPensionPlanMember
Films Manufacturing Facility In Kerkrade | Multiemployer Plans, Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees participating in pension plan | 81 tg_NumberOfEmployeesParticipatingInPensionPlan / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmsManufacturingFacilityInKerkradeMember |  |
Multi-employer pension plan, pension expenses | $ 500,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmsManufacturingFacilityInKerkradeMember | $ 500,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmsManufacturingFacilityInKerkradeMember | $ 500,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmsManufacturingFacilityInKerkradeMember

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- Definition Defined benefit, average remaining duration of benefit payments for pension plan. + References No definition available. + Details
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- Definition Expense expected to be recorded in the next twelve months for defined benefit pension plans. + References No definition available. + Details
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- Definition Number of employees participating in pension plan. + References No definition available. + Details
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- Definition Percentage of change in health care cost trend rate assumptions would be immaterial. + References No definition available. + Details
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- Definition Term of estimated benefit payments for fixed income securities, maximum. + References No definition available. + Details
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- Definition Term of estimated benefit payments for fixed income securities, minimum. + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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