Document And Entity Information
3 Months Ended
Mar. 31, 2015
May 01, 2015
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 Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   32,663,883