Ecovyst, Inc. Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Cash Flow Hedge Impact on Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Interest expense	$ (44,730)	$ (37,217)	$ (36,990)
Gain (loss) on cash flow hedging relationships \| Amount of gain (loss) reclassified from AOCI into income
Derivative [Line Items]
Interest expense	$ 22,731	$ (683)	$ (444)

Amount of the cost of borrowed funds accounted for as interest expense.