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v3.25.4

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 |  |  |

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