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Earnings per Share (Schedule of Net Income Attributable to Common Stockholders) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Net income to Westlake Chemical Corporation | $ 167,757 | $ 170,290 | $ 495,232 | $ 439,453
Less: Net income attributable to participating securities | (353) | (587) | (1,099) | (1,691)
Net income attributable to common shareholders | $ 167,404 | $ 169,703 | $ 494,133 | $ 437,762

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