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Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 1,735,180 $ 1,279,028 $ 1,086,061 $ 975,187 $ 986,766 $ 1,188,037 $ 1,185,002 $ 1,103,531 $ 5,075,456 $ 4,463,336 $ 4,415,350
Gross profit 281,478 202,133 241,366 255,585 236,188 311,276 353,181 284,546 980,562 1,185,191 1,317,350
Income from operations 152,677 46,563 179,938 202,276 181,145 254,028 295,374 229,280 581,454 959,827 1,123,991
Net income 105,289 70,014 115,620 128,936 116,157 188,420 210,061 150,407 419,859 665,045 685,016
Net income attributable to Westlake Chemical Corporation $ 98,945 $ 65,662 $ 111,124 $ 123,128 $ 110,969 $ 183,604 $ 205,095 $ 146,342 $ 398,859 $ 646,010 $ 678,523
Basic (in dollars per share) $ 0.76 $ 0.51 $ 0.85 $ 0.94 $ 0.85 $ 1.39 $ 1.55 $ 1.10 $ 3.07 $ 4.88 $ 5.09
Diluted (in dollars per share) $ 0.76 $ 0.51 $ 0.85 $ 0.94 $ 0.84 $ 1.39 $ 1.54 $ 1.10 $ 3.06 $ 4.86 $ 5.07