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Acquisitions (Pro Forma Information) (Details) (Vinnolit [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Vinnolit [Member] |  |
Pro Forma Information: |  |
Net sales | $ 4,016,935 | $ 3,747,619
Net income | 550,667 | 480,964
Net income attributable to noncontrolling interests | 2,399 | 0
Net income attributable to Westlake Chemical Corporation | $ 548,268 | $ 480,964
Earnings per common share attributable to Westlake Chemical Corporation: |  |
Basic, in dollars per share | $ 4.11 | $ 3.59
Diluted, in dollars per share | $ 4.09 | $ 3.58

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