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Guarantor Disclosures (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Sep. 30, 2014 3.60% Senior Notes Due 2022 | Aug. 04, 2014 Limited Partner [Member] IPO [Member] | Aug. 04, 2014 Limited Partner [Member] Westlake Chemical Partners LP [Member] Subsidiaries [Member] IPO [Member]
Condensed Financial Statements, Captions [Line Items] |  |  |
Stated interest rate | 3.60% |  |
Maturity | 2022 |  |
Minimum debt amount guaranteed by subsidiaries | $ 5,000 |  |
Limited partner interest |  | 89.40% | 10.60%

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