Quarterly report pursuant to Section 13 or 15(d)

Cover Page

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Cover Page - shares
6 Months Ended
Jun. 30, 2024
Jul. 26, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
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 300 Lindenwood Drive  
Entity Address, City or Town Malvern  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19355  
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   116,466,232
Entity Central Index Key 0001708035  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false