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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Annual Report true    
Document Transition Report false    
Entity File Number 1-10258    
Document Type 10-K    
Entity Address, State or Province VA    
Entity Tax Identification Number 54-1497771    
Entity Address, Address Line One 1100 Boulders Parkway,    
Entity Address, Postal Zip Code 23225    
Entity Address, State or Province VA    
Entity Address, City or Town Richmond,    
City Area Code 804    
Local Phone Number 330-1000    
Title of 12(b) Security Common Stock    
Trading Symbol TG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 406,328,122
Entity Common Stock, Shares Outstanding   33,537,892  
Documents Incorporated by Reference
Documents Incorporated By Reference
Portions of the Tredegar Corporation Proxy Statement for the 2021 Annual Meeting of Shareholders (the “Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.