Quarterly report [Sections 13 or 15(d)]

Cover Page

v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-38221  
Entity Registrant Name Ecovyst Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 81-3406833  
Entity Address, Address Line One 600 Lee Road, Suite 200  
Entity Address, City or Town Wayne  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19087  
City Area Code (484)  
Local Phone Number 617-1200  
Title of 12(b) Security Common stock, par value $0.01 per share  
Trading Symbol ECVT  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   114,417,966
Entity Central Index Key 0001708035  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false