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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions                      
Stock compensation                 $ 21,527 $ 16,212 $ 18,419
Net income attributable to PQ Group Holdings Inc. $ (299,059) $ 4,138 $ 15,926 $ 224 $ 27,169 $ 18,645 $ 30,574 $ 3,151 (278,771) 79,539 58,300
Other comprehensive income (loss), net of tax:                      
Comprehensive income attributable to PQ Group Holdings Inc.                 (293,263) 101,421 14,885
Parent Company                      
Condensed Financial Statements, Captions                      
Stock compensation                 25,200 16,212 18,419
Equity in net loss (income) from subsidiaries                 253,571 (95,751) (76,719)
Net income attributable to PQ Group Holdings Inc.                 (278,771) 79,539 58,300
Other comprehensive income (loss), net of tax:                      
Pension and postretirement benefits                 1,938 2,430 (7,958)
Net (loss) gain from hedging activities                 166 (2,665) (330)
Foreign currency translation                 (16,596) 22,117 (35,127)
Total other comprehensive income (loss)                 (14,492) 21,882 (43,415)
Comprehensive income attributable to PQ Group Holdings Inc.                 $ (293,263) $ 101,421 $ 14,885