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Retirement Plans And Other Postretirement Benefits (Schedule Of Fair Value Measurements Of Plan Assets Using Significant Unobservable Inputs (Level 3), Reconciliation Of Balances) (Details) (Private equity and hedge funds, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Private equity and hedge funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 8,814us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	$ 8,356us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Purchases	4,142us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	2,864us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Sales	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Distributions	(2,088)tg_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDistributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	(2,567)tg_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDistributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Actual return on plan assets still held at year end	207us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	161us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember
Ending Balance	$ 11,075us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember	$ 8,814us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = tg_HedgeAndPrivateEquityFundsMember

X

- Definition

Distributions of interest income and dividend that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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Namespace Prefix:	tg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting 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 (d)(iv)(02)(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

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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X

- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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