Annual report pursuant to Section 13 and 15(d)

Acquisition - Pro Forma Disclosure (Details)

v3.10.0.1
Acquisition - Pro Forma Disclosure (Details) - Sovitec Mondial S.A. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition    
Pro forma sales $ 1,488,528 $ 1,105,479
Pro forma net income (loss) 58,774 (78,234)
Pro forma net income (loss) attributable to PQ Group Holdings Inc. $ 57,814 $ (78,822)
Pro forma basic income (loss) per share $ 0.52 $ (1.01)
Pro forma diluted income (loss) per share $ 0.52 $ (1.01)