Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Total net sales	$ 1,166,695	$ 1,135,896	$ 1,190,791
Cost of sales	818,847	716,957	803,332
Gross profit	347,848	418,939	387,459
Selling, general and administrative expenses	28,271	28,495	29,751
Income from operations	319,577	390,444	357,708
Other income (expense)
Interest expense—Westlake	(22,899)	(25,701)	(26,501)
Other income, net	2,445	5,251	4,232
Income before income taxes	299,123	369,994	335,439
Provision for income taxes	547	835	813
Net income	298,576	369,159	334,626
Less: Net income attributable to noncontrolling interest in OpCo	249,878	306,767	280,343
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 48,698	$ 62,392	$ 54,283
Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted)	35,241,505	35,232,870	35,224,340
Affiliated Entity
Net co-products, ethylene and other sales—third parties	$ 1,033,276	$ 950,801	$ 1,026,655
Nonrelated Party
Net co-products, ethylene and other sales—third parties	133,419	185,095	164,136
Westlake \| Affiliated Entity
Selling, general and administrative expenses	25,017	25,654	27,085
Other income (expense)
Interest expense—Westlake	(22,899)	(25,701)	(26,501)
Common units
Other income (expense)
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 48,698	$ 62,392	$ 54,283
Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted)
Common units	$ 1.38	$ 1.77	$ 1.54
Diluted units	$ 1.38	$ 1.77	$ 1.54
Weighted average limited partner units outstanding (basic and diluted)	35,241,505	35,232,870	35,224,340
Common units \| Publicly and Privately Held
Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted)	21,119,275	21,110,640	21,102,110
Common units \| Westlake
Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted)	14,122,230	14,122,230	14,122,230

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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