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v2.4.1.9

Savings Plan (Details) (USD $) | 12 Months Ended | 11 Months Ended | 25 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 1998 | Dec. 31, 1997 | Dec. 31, 2014 | Jan. 31, 2014
Savings Plan [Line Items] |  |  |  |  |  |  |
Previous savings plan's vesting period | 5 years |  |  |  |  |  |
Charges recognized | $ 1,600,000 us-gaap_DefinedContributionPlanCostRecognized | $ 2,600,000 us-gaap_DefinedContributionPlanCostRecognized | $ 2,500,000 us-gaap_DefinedContributionPlanCostRecognized |  |  |  |
Number of common stock purchased |  |  |  | 7,200 tg_CommonStockSharesPurchasedForEmployeeTrustShares | 46,671 tg_CommonStockSharesPurchasedForEmployeeTrustShares |  |
Amount of common stock purchased |  |  |  | 200,000 tg_CommonStockSharesPurchasedForEmployeeTrust | 1,000,000 tg_CommonStockSharesPurchasedForEmployeeTrust |  |
Savings Plan |  |  |  |  |  |  |
Savings Plan [Line Items] |  |  |  |  |  |  |
Employee contribution to savings plan |  |  |  |  |  | 0.50 tg_DefinedContributionPlanEmployerEmployeeMatch / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember | 1 tg_DefinedContributionPlanEmployerEmployeeMatch / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember
Defined Contribution Plan Employer Employee Contribution |  |  |  |  |  | 1 tg_DefinedContributionPlanEmployerEmployeeContribution / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember | 1 tg_DefinedContributionPlanEmployerEmployeeContribution / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember
Maximum matching contribution |  |  |  |  |  | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember
Percentage of enrollment of base pay | 3.00%tg_DefinedContributionPlanAutomaticEnrollmentEmployeeContributionPercentage / us-gaap_DefinedContributionPlanNameAxis = tg_SavingsPlanMember |  |  |  |  |  |
Non Qualified Plan [Member] |  |  |  |  |  |  |
Savings Plan [Line Items] |  |  |  |  |  |  |
Liability under the restoration plan | $ 1,700,000 tg_LiabilityUnderRestorationBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember | $ 2,200,000 tg_LiabilityUnderRestorationBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember |  |  |  | $ 1,700,000 tg_LiabilityUnderRestorationBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember |
Liability under the restoration plan, shares | 74,190 tg_SharesHeldByRestorationPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember | 75,726 tg_SharesHeldByRestorationPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember |  |  |  | 74,190 tg_SharesHeldByRestorationPlan / us-gaap_DefinedContributionPlanNameAxis = tg_NonQualifiedPlanMember |

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- Definition Common stock shares purchased for employee trust. + References No definition available. + Details
Name: | tg_CommonStockSharesPurchasedForEmployeeTrust
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Common stock shares purchased for employee trust shares. + References No definition available. + Details
Name: | tg_CommonStockSharesPurchasedForEmployeeTrustShares
Namespace Prefix: | tg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employee salary contributions to defined contribution plan unless elected otherwise per terms of Company's defined contribution benefit plan. + References No definition available. + Details
Name: | tg_DefinedContributionPlanAutomaticEnrollmentEmployeeContributionPercentage
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Employer Employee Contribution + References No definition available. + Details
Name: | tg_DefinedContributionPlanEmployerEmployeeContribution
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined contribution plan employer employee match. + References No definition available. + Details
Name: | tg_DefinedContributionPlanEmployerEmployeeMatch
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Liability under restoration benefit plan. + References No definition available. + Details
Name: | tg_LiabilityUnderRestorationBenefitPlan
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | tg_SavingsPlanLineItems
Namespace Prefix: | tg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Savings plan, vesting period. + References No definition available. + Details
Name: | tg_SavingsPlanVestingPeriod
Namespace Prefix: | tg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares held by restoration plan. + References No definition available. + Details
Name: | tg_SharesHeldByRestorationPlan
Namespace Prefix: | tg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: 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 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=tg_NonQualifiedPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=tg_SavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |