Westlake Chemical Partners LP (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		0 Months Ended				0 Months Ended
	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)