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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule Of Net Income Attributable To Common Stockholders |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Net income attributable 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 |
Reconciliation Of Denominator For Basic And Diluted Earnings Per Share | The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Weighted average common shares—basic (1) |  | 133,299,458 |  |  | 133,257,494 |  |  | 133,199,304 |  |  | 133,256,054 |
Plus incremental shares from: |  |  |  |  |  |  |  |
Assumed exercise of options (1) |  | 546,601 |  |  | 553,614 |  |  | 543,841 |  |  | 550,704 |
Weighted average common shares—diluted (1) |  | 133,846,059 |  |  | 133,811,108 |  |  | 133,743,145 |  |  | 133,806,758 |
Earnings per common share attributable to Westlake Chemical Corporation : (1) |  |  |  |  |  |  |  |
Basic |  | $ | 1.26 |  |  | $ | 1.28 |  |  | $ | 3.71 |  |  | $ | 3.29 |
Diluted |  | $ | 1.25 |  |  | $ | 1.27 |  |  | $ | 3.69 |  |  | $ | 3.27 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Schedule of net income (loss) attributable to common stockholders [Table Text Block] + References No definition available. + Details
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