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

Stockholders' Equity - Treasury Stock Repurchases (Details)

v3.25.4

Stockholders' Equity - Treasury Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 30, 2025	Apr. 27, 2022	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Repurchases of common shares value			$ 261,131	$ 222,826
Excise taxes payable			392	$ 0	$ 638
Remaining authorized repurchase amount			$ 182,207
Tax withholdings on equity award vesting (in shares)			189,446	128,801
Fair value of shares withheld for tax payments			$ 1,477	$ 1,218	$ 3,372
Stock Repurchase Program 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 450,000
Stock repurchase program, period	4 years	4 years
Repurchases of common shares (in shares)			5,752,285	552,081
Average cost per share				$ 9.05
Repurchases of common shares value				$ 4,998
Excise taxes payable			$ 392
Stock Repurchase Program 2022 \| Open Market
Equity, Class of Treasury Stock [Line Items]
Average cost per share			$ 8.24
Repurchases of common shares value			$ 47,387
Stock Repurchase Program 2022 \| Secondary Offering
Equity, Class of Treasury Stock [Line Items]
Excise taxes payable				$ 0

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