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
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions                      
Stock compensation                 $ 20,632 $ 31,838 $ 17,194
Net income attributable to PQ Group Holdings Inc. $ 25,252 $ 21,325 $ 19,245 $ 7,875 $ 25,435 $ (71,259) $ (1,490) $ (92,635) 73,697 (139,949) (278,771)
Other comprehensive income (loss), net of tax:                      
Comprehensive income attributable to PQ Group Holdings Inc.                 85,481 (129,753) (278,688)
Parent Company                      
Condensed Financial Statements, Captions                      
Stock compensation                 20,632 39,523 25,200
Equity in net (income) loss from subsidiaries                 (94,329) 100,426 253,571
Net income attributable to PQ Group Holdings Inc.                 73,697 (139,949) (278,771)
Other comprehensive income (loss), net of tax:                      
Pension and postretirement benefits                 (2,676) 9,530 1,710
Net gain from hedging activities                 24,382 2,914 1,177
Foreign currency translation                 (9,922) (2,248) (2,804)
Total other comprehensive income (loss)                 11,784 10,196 83
Comprehensive income attributable to PQ Group Holdings Inc.                 $ 85,481 $ (129,753) $ (278,688)