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Description of Business and Significant Accounting Policies (Narrative) (Details) $ in Thousands			12 Months Ended
	Mar. 29, 2019 shares	Aug. 04, 2014 shares	Dec. 31, 2025 USD ($) production_facility numberOfCommonCarrierPipelines	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Threshold period past due accounts receivable reviewed			90 days
Capitalized interest			$ 79	$ 197	$ 164
Goodwill			$ 5,814	$ 5,814
Amortization period, minimum (in years)			5 years
Amortization period, maximum (in years)			8 years
Limited Liability Company \| Westlake Chemical OpCo GP LLC \| Westlake Chemical Partners LP
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Partnership's ownership interest (percent)		100.00%
Affiliated Entity \| Westlake Chemical OpCo LP \| Westlake Chemical Partners LP
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Partnership's ownership interest (percent)	22.80%
Westlake \| Majority-Owned Subsidiary, Unconsolidated \| Westlake Chemical OpCo LP \| Westlake Chemical Corporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Partnership's ownership interest (percent)	77.20%
Westlake Chemical OpCo LP
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of production facilities \| production_facility			3
Number of common carrier pipelines \| numberOfCommonCarrierPipelines			1
Limited Partner
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of units sold in public offering \| shares	2,940,818	12,937,500