Consolidated Entities [Axis] Consolidated Entities [Axis] Variable Rate [Domain] Variable Rate [Domain] Less: Net income attributable to noncontrolling interest in OpCo Net Income (Loss) Attributable to Noncontrolling Interest Westlake Chemical OpCo GP LLC Westlake Chemical OpCo GP LLC [Member] Westlake Chemical OpCo GP LLC [Member] Accrued and other liabilities Accrued Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Limited partner interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Total current assets Assets, Current Limited Liability Company Limited Liability Company [Member] Changes in operating assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule Of Other Assets [Table] Schedule Of Other Assets [Table] Schedule Of Other Assets [Table] Feedstock Purchased Feedstock Purchased [Member] Feedstock Purchased [Member] Amortization expense Amortization Entity Filer Category Entity Filer Category Marginal Percentage Interest in Distributions Incentive Distribution, Marginal Percentage Interest in Distributions Incentive Distribution, Marginal Percentage Interest in Distributions Total Westlake Chemical Partners LP partners' capital Partners' Capital Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date IMA, Partnership earned amount added to market rate, basis points IMA, Partnership earned amount added to market rate, basis points IMA, Partnership earned amount added to market rate, basis points Number of production facilities Number of Production Facilities Number of Production Facilities Limited Partner Limited Partner [Member] Deferred income taxes Deferred Income Tax Liabilities, Net Accounts Payable, Current Accounts Payable, Current Concentration Risk, Percentage Concentration Risk, Percentage Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Other income, net Nonoperating Income (Expense) Interest earned related to the IMA Interest earned related to the IMA Interest earned related to the IMA Commitments and contingencies (Note 12) Commitments and Contingencies Accounts Receivable, after Allowance for Credit Loss [Abstract] Accounts Receivable, after Allowance for Credit Loss [Abstract] Partners' Equity Equity [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities General Partner General Partner [Member] Senior Unsecured Revolving Credit Facility Senior Unsecured Revolving Credit Facility [Member] Senior Unsecured Revolving Credit Facility [Member] Distributions Made to Limited Partner [Table] Distributions Made to Limited Partner [Table] Description of Business and Basis of Presentation Business Description and Basis of Presentation [Text Block] Ownership [Axis] Ownership [Axis] Weighted average limited partner units outstanding (basic and diluted) (in units) Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted Above $1.6875 Cash Distribution, Tranche Three [Member] Cash Distribution, Tranche Three [Member] Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Depreciation and amortization Depreciation, Depletion and Amortization Concentration Risk [Line Items] Concentration Risk [Line Items] Customer [Axis] Customer [Axis] Accrued interest included in receivable under IMA Accrued interest included in receivable under IMA Accrued interest included in receivable under IMA Current liabilities Liabilities, Current [Abstract] Distributions per common unit (in usd per share) Distribution Made to Limited Partner, Distributions Paid, Per Unit Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Site lease agreements, term (in years) Site lease agreements, term (in years) Site lease agreements, term (in years) Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Receivable under the Investment Management Agreement—Westlake Corporation ("Westlake") Receivables under Investment Management Agreements with Related Parties, Current Receivables under Investment Management Agreements with Related Parties, Current Trading Symbol Trading Symbol Majority-Owned Subsidiary, Unconsolidated Majority-Owned Subsidiary, Nonconsolidated [Member] Westlake Westlake Parent Company And Subsidiaries, Excluding Reporting Entity And Subsidiaries [Member] Parent Company and Subsidiaries, Excluding Reporting Entity and Subsidiaries [Member] Deferred Charges and Other Assets Other Assets Disclosure [Text Block] Long-term debt payable to Westlake, fair value Long-Term Debt, Fair Value Schedule of Limited Partners' Capital Account by Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income Net income Net Income (Loss) Total current liabilities Liabilities, Current SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Accrued interest on related party debt Interest Payable, Current Shortfall Shortfall Fees Shortfall Fees Weighted average units outsanding: Earnings per Unit, Basic and Diluted, Other Disclosure [Abstract] Earnings per Unit, Basic and Diluted, Other Disclosure Finished products Inventory, Finished Goods, Gross LIABILITIES Liabilities and Equity [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Westlake Parent Company [Member] EQUITY Equity, Attributable to Parent [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Document Fiscal Period Focus Document Fiscal Period Focus Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cost of sales Cost of Goods and Services Sold Operating lease expense Operating Lease, Expense Noncontrolling interest in Westlake Chemical OpCo LP ("OpCo") Noncontrolling Interest in Limited Partnerships City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Distributions and Net Income Per Limited Partner Unit Earnings Per Share [Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Goodwill Goodwill Equity Components [Axis] Equity Components [Axis] Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted) Earnings Per Unit [Abstract] Accrued and other liabilities Increase (Decrease) in Accrued Liabilities Cash Distribution Cash Distribution [Member] Document Fiscal Year Focus Document Fiscal Year Focus Quarterly distribution to noncontrolling interest retained in OpCo by Westlake Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Other service charges Other Service Charges [Member] Other Service Charges [Member] Entity Small Business Entity Small Business Diluted (in usd per share) Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted Minimum Minimum [Member] Local Phone Number Local Phone Number Property, plant and equipment, net Property, Plant and Equipment, Net Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution Schedule of Distributions [Table Text Block] Schedule of Distributions [Table Text Block] Total equity Total equity Total equity Partners' Capital, Including Portion Attributable to Noncontrolling Interest Accounts receivable, net—third parties Receivables, Net, Current Accounts Receivable Accounts Receivable [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Long-term debt payable to Westlake Other Long-Term Debt, Noncurrent ASSETS Assets [Abstract] Nonrelated Party Nonrelated Party [Member] Accrued Liabilities Accrued Liabilities [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Depreciation expense on property, plant and equipment Depreciation Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Repayments of Related Party Debt Repayments of Related Party Debt Total liabilities and equity Liabilities and Equity Other income (expense) Nonoperating Income (Expense) [Abstract] Ownership [Domain] Ownership [Domain] Incentive distribution rights, target distribution per unit requiring marginal percentage distribution to IDR holders (in usd per share) Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders Other Assets [Line Items] Other Assets [Line Items] Other Assets [Line Items] Total net sales Revenues Summary Of Carrying And Fair Values Of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Other Assets, Noncurrent [Abstract] Other Assets, Noncurrent [Abstract] Distribution in excess of net income Undistributed Earnings, Basic Inventories Increase (Decrease) in Inventories Entity Address, City or Town Entity Address, City or Town Site lease agreement, number Site lease agreement, number Site lease agreement, number Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Amount paid to purchase additional limited partner interest Payments to Acquire Limited Partnership Interests Document Quarterly Report Document Quarterly Report Interest Expense Interest Expense Interest Expense Capital expenditures incurred but not yet paid Capital Expenditures Incurred but Not yet Paid Investments with Westlake under the Investment Management Agreement Investments with Westlake under the Investment Management Agreement Investments with Westlake under the Investment Management Agreement Supplemental Information Additional Financial Information Disclosure [Text Block] Document Transition Report Document Transition Report Interest Expense Interest Expense [Member] Related Party Transactions Related Party Transactions Disclosure [Text Block] Managing Member or General Partner [Axis] Managing Member or General Partner [Axis] Accounts payable—third parties Increase (Decrease) in Accounts Payable Common units Common units Common Units [Member] Common Units [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Accrued Liabilities [Abstract] Accrued Liabilities [Abstract] Accrued maintenance Accrued Maintenance Costs, Current Accrued Maintenance Costs, Current Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Charges from related parties in cost of sales Related Parties Amount in Cost of Sales Entity Shell Company Entity Shell Company Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Limited partner interest, additional ownership Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Additional Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Additional Ownership Interest Maturities of investments with Westlake under the Investment Management Agreement Maturities of investments with Westlake under the Investment Management Agreement Maturities of investments with Westlake under the Investment Management Agreement Counterparty Name [Domain] Counterparty Name [Domain] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Limited Partners' Capital Account Limited Partners' Capital Account Gross profit Gross Profit Security Exchange Name Security Exchange Name Subsequent Event Type [Axis] Subsequent Event Type [Axis] Selling, general and administrative expenses Selling, General and Administrative Expense Selling, General and Administrative Expense Loss from disposition of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Common units (in usd per share) Basic (in usd per share) Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current MLP Revolver MLP Revolver [Member] MLP Revolver [Member] Maximum Maximum [Member] Document Type Document Type Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Related Party [Axis] Related Party, Type [Axis] Shortfall fees recovered Shortfall fees recovered Shortfall fees recovered Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Registrant Name Entity Registrant Name Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Distribution declared per unit (in usd per unit) Distribution Made to Limited Partner, Distributions Declared, Per Unit Quarterly distributions to unitholders Distribution Made to Limited Partner, Cash Distributions Paid Goods and services purchased from Westlake and capitalized as assets Related Party Transaction Purchases From Related Party Capitalized As Assets Related Party Transaction Purchases From Related Party Capitalized As Assets Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Proceeds from debt payable to Westlake Proceeds from Related Party Debt Other losses, net Other Noncash Income (Expense) Deferred charges and other assets, net Deferred Costs and Other Assets Document Period End Date Document Period End Date Distribution Made to Limited Partner [Line Items] Distribution Made to Limited Partner [Line Items] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Accrued taxes Taxes Payable, Current Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Entity Central Index Key Entity Central Index Key Subsequent Event Subsequent Event [Member] Customer Concentration Risk Customer Concentration Risk [Member] Long-Term Debt Long-Term Debt [Member] Variable Rate [Axis] Variable Rate [Axis] Provision for income taxes Income Tax Expense (Benefit) Income Statement [Abstract] Income Statement [Abstract] IDR Holders IDR Holders [Member] Incentive Distribution Rights Holders [Member] Units outstanding Limited Partners' Capital Account, Units Outstanding Title of 12(b) Security Title of 12(b) Security Westlake Chemical OpCo LP Westlake Chemical OpCo LP [Member] Westlake Chemical OpCo LP [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Subsequent distribution to IDR holders Incentive Distribution, Subsequent Distribution Amount Amount of incentive obligation earned in cash or stock during the period by the Partnership's incentive distribution rights holders and paid after the end of the accounting period. Revenue Benchmark Revenue Benchmark [Member] Shortfall fees outstanding Shortfall fees outstanding Shortfall fees outstanding Related Party [Domain] Related Party, Type [Domain] Quarterly distribution to unitholders Limited Partners' Capital Account, Distribution Amount Above $1.2938 up to $1.4063 Cash Distribution, Tranche One [Member] Cash Distribution, Tranche One [Member] Equity [Abstract] Equity [Abstract] Inventories Inventory Disclosure [Text Block] Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Distribution Per Common Unit [Abstract] Distribution Per Common Unit [Abstract] Distribution Per Common Unit [Abstract] Other receivables Other Receivables, Net, Current Net co-products, ethylene and other sales—third parties Revenue from Contract with Customer, Excluding Assessed Tax Class of Stock [Line Items] Class of Stock [Line Items] Entity [Domain] Entity [Domain] Accrued Turnaround Costs, Current Accrued Turnaround Costs, Current Accrued Turnaround Costs, Current Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Distributions declared Distributed Earnings Quarterly distributions to noncontrolling interest retained in OpCo by Westlake Payments to Noncontrolling Interests Legal Entity [Axis] Legal Entity [Axis] Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Entity Tax Identification Number Entity Tax Identification Number Units sold in secondary offering price per unit (in dollars per share) Partners' Capital Account, Units, Sold in Public Offering, Price per Unit Partners' Capital Account, Units, Sold in Public Offering, Price per Unit Inventories Inventories Inventory, Net Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Publicly and Privately Held Unidentified Third Parties [Member] Unidentified Third Parties [Member] Feedstock, additives and chemicals Inventory, Work in Process and Raw Materials Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Statistical Measurement [Axis] Statistical Measurement [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Entity Interactive Data Current Entity Interactive Data Current Basis spread on variable rate, percent Debt Instrument, Basis Spread on Variable Rate Site lease agreements, OpCo annual obligation to WLK Site lease agreements, OpCo annual obligation to WLK Site lease agreements, OpCo annual obligation to WLK Entity Common Units, Units Outstanding Entity Common Stock, Shares Outstanding Unit Holders Unit Holders [Member] Unit Holders [Member] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Deferred Charges and Other Assets Other Assets [Member] Net accounts receivable—Westlake Increase (Decrease) in Accounts Receivable, Related Parties Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Incentive Distribution, Recipient [Domain] Incentive Distribution, Recipient [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Distribution Type [Domain] Distribution Type [Domain] Current assets Assets, Current [Abstract] Trade customers Accounts Receivable, before Allowance for Credit Loss, Current Balance Sheet Location [Axis] Balance Sheet Location [Axis] Total assets Assets Number of units sold in public offering (in shares) Partners' Capital Account, Units, Sold in Public Offering Entity Address, State or Province Entity Address, State or Province Partners' capital account, units, sold to related party (in shares) Partners' Capital Account, Units, Sold to Related Party Partners' Capital Account, Units, Sold to Related Party Counterparty Name [Axis] Counterparty Name [Axis] Cover [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] General partner—Westlake General Partners' Capital Account Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Accounts Receivable - Third Parties Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Net income per limited partner unit: Earnings Per Share, Basic [Abstract] Accounts receivable—third parties Increase (Decrease) in Accounts and Other Receivables Other income (expense) Other Nonoperating Income (Expense) [Member] Units issued Limited Partners' Capital Account, Units Issued Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Buyer deficiency fee Buyer deficiency fee Buyer deficiency fee Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Above $1.4063 up to $1.6875 Cash Distribution, Tranche Two [Member] Cash Distribution, Tranche Two [Member] Distribution Type [Axis] Distribution Type [Axis] Equity Component [Domain] Equity Component [Domain] Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Customer [Domain] Customer [Domain] Schedule Of Inventory Schedule of Inventory, Current [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Long-term Debt Payable to Westlake Related Party Transactions, Long-term Debt [Text Block] Related Party Transactions, Long-term Debt [Text Block] Income from operations Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Total liabilities Liabilities Related Party Transactions, Long-term Debt Related Party Transactions, Long-term Debt [Table Text Block] Related Party Transactions, Long-term Debt [Table Text Block] Long-term debt payable to Westlake OpCo Revolver [Member] OpCo Revolver [Member] Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets Consolidated Entities [Domain] Consolidated Entities [Domain] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class [Domain] Partners units, maximum aggregate offering amount, ATM Partners Units, Maximum Aggregate Offering Amount, ATM Partners Units, Maximum Aggregate Offering Amount, ATM Related Party Transaction [Axis] Related Party Transaction [Axis] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Statement [Line Items] Statement [Line Items] Concentration Risk [Table] Concentration Risk [Table] Distributions Made to Limited Partner, by Distribution Distributions Made to Limited Partner, by Distribution [Table Text Block] Partner Type [Axis] Partner Type [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account by Class [Axis] Affiliated Entity Affiliated Entity [Member] Noncontrolling Interest in OpCo Noncontrolling Interest [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract]