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Westlake Chemical Partners LP (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Aug. 04, 2014 IPO [Member] Limited Partner [Member] | Aug. 04, 2014 Subsidiaries [Member] Westlake Chemical Partners LP [Member] IPO [Member] | Aug. 04, 2014 Subsidiaries [Member] Westlake Chemical Partners LP [Member] IPO [Member] Limited Partner [Member] | Aug. 04, 2014 Subsidiaries [Member] Westlake Chemical Partners LP [Member] IPO [Member] Limited Partner [Member] | Aug. 04, 2014 Subsidiaries [Member] Westlake Chemical Partners LP [Member] Over-Allotment Option [Member] Limited Partner [Member] | Aug. 04, 2014 Cash Reserve Turnaround [Member] Subsidiaries [Member] Westlake Chemical OpCo LP [Member] IPO [Member] | Aug. 04, 2014 Preformation Capital Expenditure [Member] Subsidiaries [Member] Westlake Chemical OpCo LP [Member] IPO [Member] | Aug. 04, 2014 Intercompany Debt [Member] Subsidiaries [Member] Westlake Chemical OpCo LP [Member] IPO [Member]
Number of units sold in public offering |  |  |  |  | 12,937,500 |  | 1,687,500 |  |  |
Price per unit |  |  |  |  |  | $ 24.00 |  |  |  |
Approximate proceeds from sale of units | $ 286,088 | $ 0 |  |  | $ 286,088 |  |  |  |  |
Estimated offering expenses from sale of partnership units |  |  |  |  | (24,412) |  |  |  |  |
Limited partner interest |  |  | 89.40% |  | 10.60% |  |  |  |  |
Percentage sold to public in IPO |  |  |  | 47.80% |  |  |  |  |  |
Amount used from proceeds |  |  |  |  |  |  |  | $ (55,419) | $ (151,729) | $ (78,940)

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