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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2009
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]          
Interest Costs Capitalized   $ 1,100,000us-gaap_InterestCostsCapitalized $ 900,000us-gaap_InterestCostsCapitalized $ 200,000us-gaap_InterestCostsCapitalized  
Foreign Currency Transaction Gain (Loss), before Tax   (1,500,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (400,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 16,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax  
Cash and cash equivalents   50,056,000us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 52,617,000us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 48,822,000us-gaap_CashAndCashEquivalentsAtCarryingValue 68,939,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments, percentage of voting ownership interest   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage      
Goodwill, Impairment Loss 30,600,000us-gaap_GoodwillImpairmentLoss        
Goodwill Impairment Loss Net Of Tax 30,600,000us-gaap_GoodwillImpairmentLossNetOfTax        
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock   320,849us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 31,167us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 632,050us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Foreign Country          
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents   $ 40,500,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 $ 38,600,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Minimum | Buildings And Land Improvements          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   5 years      
Minimum | Machinery & equipment          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   2 years      
Maximum | Buildings And Land Improvements          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   40 years      
Maximum | Machinery & equipment          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   20 years      
PET Films          
Summary Of Significant Accounting Policies [Line Items]          
Percentage estimated fair value of PET Films exceeded carrying value of net assets   31.00%tg_PercentageEstimatedFairValueExceededCarryingValueOfNetAssets
/ us-gaap_StatementBusinessSegmentsAxis
= tg_PETFilmsMember		      
Aluminum Extrusions          
Summary Of Significant Accounting Policies [Line Items]          
Number of reporting units   2us-gaap_NumberOfReportingUnits
/ us-gaap_StatementBusinessSegmentsAxis
= tg_AluminumExtrusionsMember		      
AACOA          
Summary Of Significant Accounting Policies [Line Items]          
Percentage estimated fair value of PET Films exceeded carrying value of net assets   63.00%tg_PercentageEstimatedFairValueExceededCarryingValueOfNetAssets
/ us-gaap_StatementBusinessSegmentsAxis
= tg_AacoaIncMember		      
[1] Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $40.5 million and $38.6 million at December 31, 2014 and 2013, respectively. Export sales relate almost entirely to Film Products. Operations outside the U.S. in The Netherlands, Hungary, China, Brazil and India also relate to Film Products. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.