Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Statements of Income (Details)

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Schedule I - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions      
Stock compensation $ 16,031 $ 20,632 $ 31,838
Net income (loss) attributable to Ecovyst Inc. 71,154 73,697 (139,949)
Other comprehensive income (loss), net of tax:      
Comprehensive income attributable to PQ Group Holdings Inc. 64,204 85,481 (129,753)
Parent Company      
Condensed Financial Statements, Captions      
Stock compensation 16,031 20,632 39,523
Equity in net (income) loss from subsidiaries (87,185) (94,329) 100,426
Net income (loss) attributable to Ecovyst Inc. 71,154 73,697 (139,949)
Other comprehensive income (loss), net of tax:      
Pension and postretirement benefits 1,120 (2,676) 9,530
Net gain (loss) from hedging activities (12,126) 24,382 2,914
Foreign currency translation 4,056 (9,922) (2,248)
Total other comprehensive income (loss) (6,950) 11,784 10,196
Comprehensive income attributable to PQ Group Holdings Inc. $ 64,204 $ 85,481 $ (129,753)