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

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

Long-term Debt - 2021 Term Loan Facility (Details)

Long-term Debt - 2021 Term Loan Facility (Details) - USD ($) $ in Thousands					1 Months Ended	12 Months Ended
	Jan. 30, 2025	Jun. 12, 2024	Feb. 09, 2023	Jun. 09, 2021	Jan. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt						$ 870,817	$ 877,500
Debt extinguishment costs						90	0	$ 0
Term Loan Facility
Debt Instrument [Line Items]
Debt extinguishment costs						4,471
Unamortized discount, noncurrent						2,183
Write off of deferred financing costs						30
Unamortized discount, write off						$ 59
Term Loan Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate, spread adjustment		0.10%
Interest rate, effective percentage						6.84%
Term Loan Facility \| Secured Overnight Financing Rate (SOFR) \| Minimum \| Variable Rate Component One
Debt Instrument [Line Items]
Variable basis spread		2.25%
Term Loan Facility \| Secured Overnight Financing Rate (SOFR) \| Maximum \| Variable Rate Component One
Debt Instrument [Line Items]
Variable basis spread		2.75%
Term Loan Facility \| Base Rate \| Minimum \| Variable Rate Component Two
Debt Instrument [Line Items]
Variable basis spread		1.25%
Term Loan Facility \| Base Rate \| Minimum \| Variable Rate Component Two \| Subsequent Event
Debt Instrument [Line Items]
Variable basis spread	1.00%
Term Loan Facility \| Base Rate \| Maximum \| Variable Rate Component Two
Debt Instrument [Line Items]
Variable basis spread		1.75%
Term Loan Facility \| Base Rate \| Maximum \| Variable Rate Component Two \| Subsequent Event
Debt Instrument [Line Items]
Variable basis spread	1.25%
Term Loan Facility \| Term Loan Facility
Debt Instrument [Line Items]
Total debt				$ 900,000		$ 870,817	$ 877,500
Original issue discount				0.25%
Variable rate floor				0.50%
Variable basis spread				2.75%
Debt instrument, first lien leverage ratio			2.50%	2.50%
Scheduled quarterly principal payments				0.25%
Term Loan Facility \| Term Loan Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate floor			0.50%
Variable basis spread			2.75%
Term Loan Facility 2024 \| Subsequent Event
Debt Instrument [Line Items]
Variable basis spread					2.00%