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Document And Entity Information - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jul. 30, 2021
Document And Entity Information [Abstract]      
Entity Central Index Key   0000850429  
Current Fiscal Year End Date   --12-31  
Entity Filer Category Accelerated Filer    
Document Fiscal Year Focus   2021  
Document Fiscal Period Focus (Q1,Q2,Q3,FY)   Q1  
Amendment Flag   false  
Entity File Number 1-10258    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 54-1497771    
Entity Address, Address Line One 1100 Boulders Parkway    
Entity Address, City or Town Richmond,    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 23225    
City Area Code (804)    
Local Phone Number 330-1000    
Title of 12(b) Security Common stock, no par value    
Trading Symbol TG    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Entity Registrant Name Tredegar Corporation    
Entity Common Stock, Shares Outstanding     33,727,317
Document Type 10-Q    
Document Quarterly Report true    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Document Period End Date   Jun. 30, 2021  
Document Transition Report   false