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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 169,687us-gaap_Goodwill	$ 172,788us-gaap_Goodwill	$ 176,620us-gaap_Goodwill	$ 165,372us-gaap_Goodwill
Identifiable intangible assets:
Total carrying value of other intangibles	45,442us-gaap_OtherIntangibleAssetsNet	53,512us-gaap_OtherIntangibleAssetsNet
Intangible Assets, Net (Including Goodwill)	215,129us-gaap_IntangibleAssetsNetIncludingGoodwill	226,300us-gaap_IntangibleAssetsNetIncludingGoodwill
Customer relationships
Identifiable intangible assets:
Other identifiable intangibles	21,620us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	25,962us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Other identifiable intangibles, cost basis	29,117us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	31,357us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Proprietary technology
Identifiable intangible assets:
Other identifiable intangibles	11,824us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember	14,356us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember
Other identifiable intangibles, cost basis	18,228us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember	18,851us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember
Noncompete agreements
Identifiable intangible assets:
Other identifiable intangibles	0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	600us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Identifiable Intangible Asset, Useful Life (Yrs)	2 years
Other identifiable intangibles, cost basis	4,154us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	4,154us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Trade names
Identifiable intangible assets:
Trade names	$ 11,998us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	$ 12,594us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Minimum | Customer relationships
Identifiable intangible assets:
Identifiable Intangible Asset, Useful Life (Yrs)	10 years
Maximum | Customer relationships
Identifiable intangible assets:
Identifiable Intangible Asset, Useful Life (Yrs)	12 years
Maximum | Proprietary technology
Identifiable intangible assets:
Identifiable Intangible Asset, Useful Life (Yrs)	15 years

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