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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2016
Jan. 31, 2017
Jun. 30, 2016
Document And Entity Information [Abstract]      
Entity Registrant Name TREDEGAR CORP    
Entity Central Index Key 0000850429    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus (Q1,Q2,Q3,FY) FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   32,963,939  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 411,286,270