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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
Equity, beginning balance at Dec. 31, 2022 $ 903,708 $ 611,778 $ (242,572) $ 480,643 $ 53,859
Stockholders' Equity [Roll Forward]          
Net income 334,626 280,343 0 32,519 21,764
Units issued for vested phantom units 141     141  
Distribution to unitholders (66,420)     (39,790) (26,630)
Distribution to noncontrolling interest retained in OpCo by Westlake (315,805) (315,805)      
Equity, ending balance at Dec. 31, 2023 856,250 576,316 (242,572) 473,513 48,993
Stockholders' Equity [Roll Forward]          
Net income 369,159 306,767 0 37,384 25,008
Units issued for vested phantom units 238     238  
Distribution to unitholders (66,435)     (39,807) (26,628)
Distribution to noncontrolling interest retained in OpCo by Westlake (329,898) (329,898)      
Equity, ending balance at Dec. 31, 2024 829,314 553,185 (242,572) 471,328 47,373
Stockholders' Equity [Roll Forward]          
Net income 298,576 249,878 0 29,183 19,515
Units issued for vested phantom units 161     161  
Distribution to unitholders (66,452)     (39,824) (26,628)
Distribution to noncontrolling interest retained in OpCo by Westlake (259,247) (259,247)      
Equity, ending balance at Dec. 31, 2025 $ 802,352 $ 543,816 $ (242,572) $ 460,848 $ 40,260