Ecovyst, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Divestitures - Schedule Of Financing Obligation Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Obligations, Assets And Liabilities [Line Items]
Financing obligation, asset	$ 14,173	$ 19,878
Total lease liabilities	4,858	7,926
Property, plant and equipment, net
Financing Obligations, Assets And Liabilities [Line Items]
Financing obligation, asset	14,173	19,878
Accrued liabilities
Financing Obligations, Assets And Liabilities [Line Items]
Total lease liabilities	3,043	2,999
Other long-term liabilities
Financing Obligations, Assets And Liabilities [Line Items]
Total lease liabilities	$ 1,815	$ 4,927