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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol SCL    
Entity Registrant Name STEPAN COMPANY    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Central Index Key 0000094049    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Tax Identification Number 36-1823834    
Entity File Number 1-4462    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 1101 Skokie Boulevard    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Northbrook    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60062    
City Area Code 847    
Local Phone Number 446-7500    
Security Exchange Name NYSE    
Title of 12(b) Security Common Stock, $1 par value    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   22,421,100  
Entity Public Float     $ 2,582,080,839
ICFR Auditor Attestation Flag true    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location Chicago, Illinois    
Auditor Firm ID 34    
Documents Incorporated by Reference

Documents Incorporated by Reference

 

Part of Form 10-K

 

Document Incorporated

Part III, Items 10-14

 

Portions of the Proxy Statement for Annual Meeting of Stockholders expected to be held April 26, 2022.

* Based on reported ownership by all directors and executive officers at June 30, 2021.