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Acquisitions (Narratives) (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 02, 2012
Dec. 31, 2012
Oct. 24, 2011
Business Acquisition [Line Items]                            
Payments to Acquire Businesses, Net of Cash Acquired                 $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ (561,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 57,936,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Sales 239,219,000us-gaap_SalesRevenueGoodsNet 240,429,000us-gaap_SalesRevenueGoodsNet 236,965,000us-gaap_SalesRevenueGoodsNet 235,213,000us-gaap_SalesRevenueGoodsNet 231,096,000us-gaap_SalesRevenueGoodsNet 243,194,000us-gaap_SalesRevenueGoodsNet 243,530,000us-gaap_SalesRevenueGoodsNet 241,526,000us-gaap_SalesRevenueGoodsNet 951,826,000us-gaap_SalesRevenueGoodsNet 959,346,000us-gaap_SalesRevenueGoodsNet 882,188,000us-gaap_SalesRevenueGoodsNet      
Net income from continuing operations 13,054,000us-gaap_IncomeLossFromContinuingOperations 10,745,000us-gaap_IncomeLossFromContinuingOperations 3,752,000us-gaap_IncomeLossFromContinuingOperations 8,479,000us-gaap_IncomeLossFromContinuingOperations 9,402,000us-gaap_IncomeLossFromContinuingOperations 7,428,000us-gaap_IncomeLossFromContinuingOperations 9,590,000us-gaap_IncomeLossFromContinuingOperations 9,517,000us-gaap_IncomeLossFromContinuingOperations 36,029,000us-gaap_IncomeLossFromContinuingOperations 35,937,000us-gaap_IncomeLossFromContinuingOperations 43,185,000us-gaap_IncomeLossFromContinuingOperations      
AACOA                            
Business Acquisition [Line Items]                            
Percentage of outstanding equity interests acquired                       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		    
Total purchase price                       54,100,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		    
Cash received from seller               600,000tg_BusinessAcquisitionCostOfAcquiredEntityPostClosingSettlementReceived
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		            
Financing used to fund purchase price from existing credit facility                       350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		    
Sales                         19,900,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		  
Net income from continuing operations                         1,000,000us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_BusinessAcquisitionAxis
= tg_AacoaIncMember		  
Terphane                            
Business Acquisition [Line Items]                            
Percentage of outstanding equity interests acquired                           100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tg_TerphaneHoldingsLlcMember
Payments to Acquire Businesses, Net of Cash Acquired                     3,300,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= tg_TerphaneHoldingsLlcMember		      
Total purchase price                           182,700,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= tg_TerphaneHoldingsLlcMember
Available cash used to fund purchase price                           57,700,000tg_BusinessAcquisitionCostOfAcquisitionCashBalancesToFundPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= tg_TerphaneHoldingsLlcMember
Financing used to fund purchase price                           $ 125,000,000tg_BusinessAcquisitionCostOfAcquisitionBorrowingsToFundPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= tg_TerphaneHoldingsLlcMember