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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 29, 2015, Westlake Chemical Partners LP ("Westlake Partners") purchased an additional 2.7% newly issued limited partner interest in OpCo for approximately $135,341, resulting in Westlake Partners holding approximately an aggregate 13.3% limited partner interest in OpCo and the Company holding approximately an aggregate 86.7% limited partner interest in OpCo. In order to fund this purchase, Westlake Partners entered into a revolving credit facility with a subsidiary of the Company, which has a total borrowing capacity of $300,000. Subsequent events were evaluated through the date on which the financial statements were issued.