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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
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income attributable to Westlake Chemical Corporation $ 146,342us-gaap_NetIncomeLoss $ 158,032us-gaap_NetIncomeLoss
Less: Net income attributable to participating securities (200)wlk_NetIncomeLossAvailableToParticipatingSecurities (384)wlk_NetIncomeLossAvailableToParticipatingSecurities
Net income attributable to common shareholders $ 146,142wlk_NetIncomeLossAvailableToCommonStockholders $ 157,648wlk_NetIncomeLossAvailableToCommonStockholders