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

Income Taxes - Payment for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards
Income taxes, net of refunds	$ 26,259	$ 22,437	$ 25,556
Continuing Operations
Operating Loss Carryforwards
Income taxes, net of refunds	26,259	22,437	13,636
Domestic \| Continuing Operations
Operating Loss Carryforwards
Income taxes, net of refunds	22,860	21,973	13,277
Foreign \| Continuing Operations
Operating Loss Carryforwards
Income taxes, net of refunds	$ 3,399	$ 464	$ 359