Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Summary (Unaudited) (Details)

v3.8.0.1
Quarterly Financial Summary (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 358,074 $ 391,829 $ 389,267 $ 332,931 $ 322,731 $ 369,979 $ 277,554 $ 93,913 $ 1,472,101 $ 1,064,177 $ 388,875
Gross profit 84,151 102,559 107,414 82,712 70,394 95,299 62,298 26,101 376,836 254,092 110,084
Operating income 27,882 46,558 55,149 37,915 15,139 44,254 16,749 8,048 167,504 84,190 55,775
Net income (loss) 65,564 (3,016) (1,670) (2,315) 10,527 (9,606) (76,948) (3,131) 58,563 (79,158) 11,427
Net income (loss) attributable to PQ Group Holdings Inc. $ 65,011 $ (3,345) $ (1,609) $ (2,454) $ 10,664 $ (10,017) $ (77,262) $ (3,131) $ 57,603 $ (79,746) $ 11,427
Net income (loss) per share:                      
Basic income (loss) per share (usd per share) $ 0.49 $ (0.03) $ (0.02) $ (0.02) $ 0.10 $ (0.10) $ (0.99) $ (0.14) $ 0.52 $ (1.02) $ 0.51
Diluted income (loss) per share (usd per share) $ 0.49 $ (0.03) $ (0.02) $ (0.02) $ 0.10 $ (0.10) $ (0.99) $ (0.14) $ 0.52 $ (1.02) $ 0.51
Weighted average shares outstanding:                      
Basic (shares) 133,138,140 104,096,837 104,015,815 103,947,888 103,947,888 103,783,719 77,842,216 22,694,161 111,299,670 78,016,005 22,615,787
Diluted (shares) 133,895,646 104,096,837 104,015,815 103,947,888 103,947,888 103,783,719 77,842,216 22,694,161 111,669,037 78,016,005 22,615,787