Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Noncontrolling Interest in OpCo	Westlake General Partner	Common units Publicly and Privately Held Limited Partner	Common units Westlake Limited Partner
Total equity at Dec. 31, 2023	$ 856,250	$ 576,316	$ (242,572)	$ 473,513	$ 48,993
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89,646	74,813	0	8,887	5,946
Distribution to unitholders	(16,607)	0	0	(9,950)	(6,657)
Distribution to noncontrolling interest retained in OpCo by Westlake	(81,044)	(81,044)	0	0	0
Total equity at Mar. 31, 2024	848,245	570,085	(242,572)	472,450	48,282
Total equity at Dec. 31, 2024	829,314	553,185	(242,572)	471,328	47,373
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,309	37,361	0	2,965	1,983
Distribution to unitholders	(16,611)	0	0	(9,954)	(6,657)
Distribution to noncontrolling interest retained in OpCo by Westlake	(51,906)	(51,906)	0	0	0
Total equity at Mar. 31, 2025	$ 803,106	$ 538,640	$ (242,572)	$ 464,339	$ 42,699