Turnaround costs, net
Turnaround Costs, Net
Turnaround Costs, Net
Limited Partners' Capital Account by Class [Axis]
Limited Partners' Capital Account by Class [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Transportation and Freight
Shipping and Handling Cost, Policy [Policy Text Block]
Award Timing Predetermined
Award Timing Predetermined [Flag]
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Weighted average interest rate on all long-term debt
Long-Term Debt, Weighted Average Interest Rate, at Point in Time
Feedstock Purchased
Feedstock Purchased [Member]
Feedstock Purchased [Member]
Entity File Number
Entity File Number
Tabular List, Table
Tabular List [Table Text Block]
Supplemental Information
Additional Financial Information Disclosure [Text Block]
Recent Issued Accounting Pronouncements and Recently Adopted Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
Plant and equipment
Machinery and Equipment, Gross
Property, plant and equipment, net, before construction in progress
Property, Plant and Equipment, Net Excluding Construction In-Progress
Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Does not include construction in progress.
Schedule of Related Party Transactions
Schedule of Related Party Transactions [Table Text Block]
Accounts payable—third parties
Increase (Decrease) in Accounts Payable
Schedule Of Carrying And Fair Values Of Long-Term Debt
Fair Value, by Balance Sheet Grouping [Table Text Block]
Majority-Owned Subsidiary, Unconsolidated
Majority-Owned Subsidiary, Nonconsolidated [Member]
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Interest earned related to the IMA
Interest earned related to the IMA
Interest earned related to the IMA
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
Stock, Class of Stock [Table]
Stock, Class of Stock [Table]
Schedule of Segment Reporting Information, by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Incentive Distribution, Recipient [Domain]
Incentive Distribution, Recipient [Domain]
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Concentration Risk, Percentage
Concentration Risk, Percentage
Affiliated Entity
Affiliated Entity [Member]
Accrued interest included in receivable under IMA
Accrued interest included in receivable under IMA
Accrued interest included in receivable under IMA
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner [Line Items]
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Cash And Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Income taxes paid
Income Taxes Paid
Percentage
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Insider Trading Policies and Procedures [Line Items]
Total compensation cost
Share-Based Payment Arrangement, Expense
Schedule Of Property, Plant And Equipment
Property, Plant and Equipment [Table Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Current assets
Assets, Current [Abstract]
Total liabilities and equity
Liabilities and Equity
Amortization period, maximum (in years)
Plant And Equipment Planned Major Maintenance Activities Amortization Period Maximum
The maximum amortization period of planned major maintenance activities.
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
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
Receivables under Investment Management Agreements with Related Parties, Current
LIABILITIES
Liabilities and Equity [Abstract]
State and Local Jurisdiction
State and Local Jurisdiction [Member]
Cover [Abstract]
Cover [Abstract]
Maximum
Maximum [Member]
Westlake
Parent Company And Subsidiaries, Excluding Reporting Entity And Subsidiaries [Member]
Parent Company and Subsidiaries, Excluding Reporting Entity and Subsidiaries [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Net [Abstract]
Less: Net income attributable to noncontrolling interest in OpCo
Net Income (Loss) Attributable to Noncontrolling Interest
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Loss from disposition of property, plant and equipment
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Fair value of phantom units vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Leverage capital ratio required during other periods
Leverage Capital Ratio Required During Other Periods
Represents the consolidated leverage ratio required per the debt agreement during periods other than than one-year period following certain types of acquisitions
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Pay vs Performance Disclosure [Line Items]
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Long-Term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Turnaround Costs
Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block]
Entity Shell Company
Entity Shell Company
Schedule of Distributions
Schedule of Distributions [Table Text Block]
Schedule of Distributions
Other liabilities
Other Liabilities, Noncurrent
Operating Segments
Operating Segments [Member]
Number of years used to calculate average expenses
Long-term Purchase Commitment, Terms of Fee, Number Of Years Used To Calculate Average Expenses
Long-term Purchase Commitment, Terms of Fee, Number Of Years Used To Calculate Average Expenses
Schedule of Cash Flow, Supplemental Disclosures
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Company Selected Measure Amount
Company Selected Measure Amount
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Name
Measure Name
Texas
TEXAS
Number of units sold in public offering
Partners' Capital Account, Units, Sold in Public Offering
Other Service Charges
Other Service Charges [Member]
Other Service Charges [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Deferred income taxes
Noncurrent deferred tax liability
Deferred Income Tax Liabilities, Net
Document Fiscal Period Focus
Document Fiscal Period Focus
Award Timing Method
Award Timing Method [Text Block]
Distributions Made to Limited Partner [Table]
Distributions Made to Limited Partner [Table]
Award Type [Axis]
Award Type [Axis]
Legal Entity [Axis]
Legal Entity [Axis]
Period of default in performance that can allow a party to terminate agreement
Related Party Transaction, Counterparty Default, Period Of Default, Allowing Termination Of Agreement
Related Party Transaction, Counterparty Default, Period Of Default, Allowing Termination Of Agreement
Total assets
Assets
Assets
Schedule of Nonvested Restricted Stock Units Activity
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Trading Symbol
Trading Symbol
Weighted Average Grant Date Fair Value, Vested (usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Total Westlake Chemical Partners LP partners' capital
Partners' Capital
Income Taxes
Income Tax, Policy [Policy Text Block]
Entity Address, City or Town
Entity Address, City or Town
Cash flows from operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Distributions per common unit
Distribution Made to Limited Partner, Distributions Paid, Per Unit
Other segment items
Segment Reporting, Other Segment Item, Amount
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Inventories
Inventory Disclosure [Text Block]
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Statement of Income Location, Balance [Domain]
Statement of Income Location, Balance [Domain]
Allowance For Doubtful Accounts
Credit Loss, Financial Instrument [Policy Text Block]
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
General Partner
General Partner [Member]
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Right-of-use assets obtained in exchange for operating lease obligations
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Document Financial Statement Error Correction [Flag]
Document Financial Statement Error Correction [Flag]
State income tax provision, net of federal income tax effect (1)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Schedule Of The Provision For (Benefit From) Income Taxes
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Exchange agreement amount of purchase agreement
Purchase Commitment, Purchase Agreement, Mass
Purchase Commitment, Purchase Agreement, Mass
Plan Name [Axis]
Plan Name [Axis]
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
PEO
PEO [Member]
Accounts Receivable—Third Parties
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Investments with Westlake under the Investment Management Agreement
Investments with Westlake under the Investment Management Agreement
Investments with Westlake under the Investment Management Agreement
Proceeds from debt payable to Westlake
Proceeds from Related Party Debt
Deferred charges and other assets, net
Deferred charges and other assets, net
Deferred Costs and Other Assets
Current
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income Tax Paid, by Individual Jurisdiction [Line Items]
Income Tax Paid, by Individual Jurisdiction [Line Items]
Weighted average limited partner units outstanding (basic and diluted)
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted
Changes in operating assets and liabilities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member]
Property, plant and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Units issued
Limited Partners' Capital Account, Units Issued
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Income Tax Jurisdiction [Axis]
Income Tax Jurisdiction [Axis]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Restatement Determination Date
Restatement Determination Date
Related Parties Amount in Cost of Sales
Related Parties Amount in Cost of Sales
Share-based Payment Arrangement [Abstract]
Share-Based Payment Arrangement [Abstract]
Cash and cash equivalents at beginning of the year
Cash and cash equivalents at end of the year
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Income Statement [Abstract]
Income Statement [Abstract]
Provision for income taxes
Total provision
Income Tax Expense (Benefit)
Basis spread on variable rate, percent
Debt Instrument, Basis Spread on Variable Rate
Noncontrolling interest in Westlake Chemical OpCo LP ("OpCo")
Noncontrolling Interest in Limited Partnerships
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Customer Concentration Risk
Customer Concentration Risk [Member]
Net income
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Partnership income not subject to entity-level federal income tax
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount
Income Tax Paid, by Individual Jurisdiction [Table]
Income Tax Paid, by Individual Jurisdiction [Table]
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
City Area Code
City Area Code
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Buildings and improvements
Building and Building Improvements [Member]
All Trading Arrangements
All Trading Arrangements [Member]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Site Lease Agreement
Site Lease Agreement [Member]
Site Lease Agreement [Member]
Capitalized interest
Interest Costs Capitalized
Accrued and other liabilities
Accrued Liabilities, Current
Partnership income not subject to entity-level federal income tax
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent
Cash Distribution
Cash Distribution [Member]
Long-term Purchase Commitment, Curtail Option Percentage
Long-term Purchase Commitment, Curtail Option Percentage
Long-term Purchase Commitment, Curtail Option Percentage
Beginning balance
Ending balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Building and improvements
Buildings and Improvements, Gross
Total deferred tax liabilities
Deferred Tax Liabilities, Net
MLP Revolver
MLP Revolver [Member]
MLP Revolver [Member]
Cash flows from investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Related Party Transactions [Abstract]
Related Party Transactions [Abstract]
Plant and equipment
Plant And Equipment [Member]
Plant And Equipment [Member]
Property, plant and equipment, useful life (in years)
Property, Plant and Equipment, Useful Life
Subsequent Event
Subsequent Event [Member]
Selling, General and Administrative Expenses
Selling, General and Administrative Expenses [Member]
Goodwill
Goodwill
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
PEO Total Compensation Amount
PEO Total Compensation Amount
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Depreciation expense
Depreciation
Equity Components [Axis]
Equity Components [Axis]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
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
Auditor Name
Auditor Name
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Long-term debt payable to Westlake
Other Long-Term Debt, Noncurrent
Number of reportable segments
Number of Reportable Segments
Feedstock Supply Agreement
Feedstock Supply Agreement [Member]
Feedstock Supply Agreement [Member]
Amortization period, minimum (in years)
Plant And Equipment Planned Major Maintenance Activities Amortization Period Minimum
The minimum amortization period of planned major maintenance activities.
Other Performance Measure, Amount
Other Performance Measure, Amount
Entity Address, State or Province
Entity Address, State or Province
IDR Holders
IDR Holders [Member]
Incentive Distribution Rights Holders [Member]
Related Party [Domain]
Related and Nonrelated Parties [Domain]
Westlake Chemical OpCo LP
Westlake Chemical OpCo LP [Member]
Westlake Chemical OpCo LP [Member]
Total current liabilities
Liabilities, Current
Amount
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Individual:
Individual [Axis]
Income Tax Jurisdiction [Domain]
Income Tax Jurisdiction [Domain]
Managing Member or General Partner [Axis]
Managing Member or General Partner [Axis]
Above $1.2938 up to $1.4063
Cash Distribution, Tranche One [Member]
Cash Distribution, Tranche One [Member]
Westlake Chemical Partners LP
Westlake Chemical Partners LP [Member]
Westlake Chemical Partners LP
Document Annual Report
Document Annual Report
Entity [Domain]
Entity [Domain]
Amortization
Amortization
Net cash provided by (used for) investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net income per limited partner unit attributable to Westlake Chemical Partners LP (basic and diluted)
Earnings Per Unit [Abstract]
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Interest paid
Interest Paid, Excluding Capitalized Interest, Operating Activity
Document Fiscal Year Focus
Document Fiscal Year Focus
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Units sold in secondary offering price per unit
Partners' Capital Account, Units, Sold in Public Offering, Price per Unit
Partners' Capital Account, Units, Sold in Public Offering, Price per Unit
OpCo
OpCo Segment [Member]
OpCo Segment
Total provision
Effective Income Tax Rate Reconciliation, Percent
Entity Interactive Data Current
Entity Interactive Data Current
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Plan Name [Domain]
Plan Name [Domain]
Unrecognized compensation weighted average remaining term
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Net accounts receivable—Westlake
Increase (Decrease) in Accounts Receivable, Related Parties
Equity [Abstract]
Equity [Abstract]
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
Ethylene Sales Agreement
Ethylene Sales Agreement [Member]
Ethylene Sales Agreement [Member]
Segment Information
Segment Reporting Disclosure [Text Block]
Other assets amortization period
Finite-Lived Intangible Assets, Remaining Amortization Period
Property, Plant and Equipment by Type [Axis]
Long-Lived Tangible Asset [Axis]
Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Deferred Charges and Other Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Distributions Made to Limited Partner, by Distribution
Distributions Made to Limited Partner, by Distribution [Table Text Block]
Other
Other Capitalized Property Plant and Equipment [Member]
Ownership [Domain]
Ownership [Domain]
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Selling, general and administrative expenses
Services received from Westlake and included in selling, general and administrative expenses
Selling, General and Administrative Expense
Investee
Investee [Member]
Depreciation and amortization
Depreciation, Depletion and Amortization
Customer [Domain]
Customer [Domain]
Accrued interest on related party debt
Accrued interest
Interest Payable, Current
Entity Central Index Key
Entity Central Index Key
Other
Property, Plant and Equipment, Other, Gross
PEO Name
PEO Name
Total net sales
Revenues
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finished products
Inventory, Finished Goods, Gross
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Arrangement Duration
Trading Arrangement Duration
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segments [Axis]
Segments [Axis]
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Exercise Price
Award Exercise Price
Maximum mass required to be purchased
Long-term Purchase Commitment, Maximum Volume Required
Long-term Purchase Commitment, Maximum Volume Required
Entity Filer Category
Entity Filer Category
Limited Partner
Limited Partner [Member]
Local Phone Number
Local Phone Number
Description Of Business
Description Of Business [Policy Text Block]
Description Of Business [Policy Text Block]
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Unrecognized compensation cost
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Trade customers
Accounts Receivable, before Allowance for Credit Loss, Current
Provision for federal income tax, at statutory rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Unit-based Compensation
Share-Based Payment Arrangement [Text Block]
Limited partners' capital
Limited Partners' Capital Account
Buyer deficiency fee
Buyer deficiency fee
Buyer deficiency fee
Above $1.4063 up to $1.6875
Cash Distribution, Tranche Two [Member]
Cash Distribution, Tranche Two [Member]
Reimbursement to Parent for State Tax
Reimbursement to Parent for State Tax [Member]
Reimbursement to Parent for State Tax [Member]
ASSETS
Assets [Abstract]
Nonrelated Party
Nonrelated Party [Member]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Axis]
Debt Instrument [Axis]
Debt Instrument [Axis]
Fair Value Measurements
Fair Value Disclosures [Text Block]
EQUITY
Equity, Attributable to Parent [Abstract]
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Entity Address, Address Line Two
Entity Address, Address Line Two
Allowance for credit losses
Accounts Receivable, Allowance for Credit Loss, Current
Feedstock, additives and chemicals
Inventory, Work in Process and Raw Materials
Entity Voluntary Filers
Entity Voluntary Filers
Ownership [Axis]
Ownership [Axis]
Insurance Recoveries
Insurance Recoveries
Fair Value as of Grant Date
Award Grant Date Fair Value
Entity Registrant Name
Entity Registrant Name
Long-Term Purchase Commitment, Renewal Term
Long-Term Purchase Commitment, Renewal Term
Long-Term Purchase Commitment, Renewal Term
Partners' Capital, Limited Partner's Capital Account, Class [Table]
Partners' Capital, Limited Partner's Capital Account, Class [Table]
Distribution in excess of net income
Distribution in excess of net income
Undistributed Earnings, Basic
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Schedule Of Long-Term Debt
Schedule of Long-Term Debt Instruments [Table Text Block]
Other
Noncurrent Assets, Other, Net
Noncurrent Assets, Other, Net
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Westlake Chemical OpCo GP LLC
Westlake Chemical OpCo GP LLC [Member]
Westlake Chemical OpCo GP LLC [Member]
Long-term debt payable to Westlake, fair value
Long-Term Debt, Fair Value
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Counterparty Name [Domain]
Counterparty Name [Domain]
Number of operating segments
Number of Operating Segments
Distribution declared per unit (usd per share)
Distribution Made to Limited Partner, Distributions Declared, Per Unit
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Weighted Average Grant Date Fair Value, Granted (usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Related Party [Axis]
Related and Nonrelated Parties [Axis]
Title
Trading Arrangement, Individual Title
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Marginal Percentage Interest in Distributions
Incentive Distribution, Marginal Percentage Interest in Distributions
Incentive Distribution, Marginal Percentage Interest in Distributions
Restatement Determination Date:
Restatement Determination Date [Axis]
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
Non-PEO NEO
Non-PEO NEO [Member]
Accounts Receivable
Accounts Receivable [Member]
Number of production facilities
Number of Production Facilities
Number of Production Facilities
Name
Trading Arrangement, Individual Name
Award Type [Domain]
Award Type [Domain]
Units issued for vested phantom units
Stock Issued During Period, Value, Other
Goodwill
Goodwill Disclosure [Text Block]
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Other gains, net
Other Noncash Income (Expense)
Raw material, energy, manufacturing and logistics costs
Raw material, energy, manufacturing and logistics costs
Raw material, energy, manufacturing and logistics costs
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Accounts receivable—third parties
Increase (Decrease) in Accounts and Other Receivables
Compensation Amount
Outstanding Recovery Compensation Amount
Deferred
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Senior Unsecured Revolving Credit Facility
Senior Unsecured Revolving Credit Facility [Member]
Senior Unsecured Revolving Credit Facility [Member]
Excess Production Option
Excess Production Option [Member]
Excess Production Option [Member]
Above $1.6875
Cash Distribution, Tranche Three [Member]
Cash Distribution, Tranche Three [Member]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Organization consolidation and presentation of financial statements [Line Items].
Weighted Average Fair Value, beginning balance (usd per share)
Weighted Average Fair Value, ending balance (usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Deferred Charges and Other Assets
Other Assets Disclosure [Text Block]
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Distribution Type [Axis]
Distribution Type [Axis]
Ethylene pipeline
Ethylene Pipeline [Member]
Ethylene Pipeline [Member]
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Westlake Chemical Partners LP Long-Term Incentive Plan
Westlake Chemical Partners LP Long-Term Incentive Plan [Member]
Westlake Chemical Partners LP Long-Term Incentive Plan [Member]
Goodwill, Gross
Goodwill, Gross
Purchase commitment, fixed margin on variable pricing
Long-term Purchase Commitment, Exchange Fee, Fixed Margin
Long-term Purchase Commitment, Exchange Fee, Fixed Margin
Distribution to unitholders
Limited Partners' Capital Account, Distribution Amount
Schedule Of Estimated Useful Lives Of Assets
Schedule Of Estimated Useful Lives Of Assets [Table Text Block]
Table of estimated useful lives of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
Auditor Firm ID
Auditor Firm ID
Segments [Domain]
Segments [Domain]
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Axis]
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Statement of Financial Position Location, Balance [Domain]
Statement of Financial Position Location, Balance [Domain]
Inventories
Increase (Decrease) in Inventories
Inventories
Inventories
Inventory, Net
Minimum
Minimum [Member]
Less: Accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Company Selected Measure Name
Company Selected Measure Name
Services And Secondment Agreement
Services And Secondment Agreement [Member]
Services And Secondment Agreement [Member]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Accounts payable—third parties
Accounts Payable, Current
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
All Executive Categories
All Executive Categories [Member]
Property, plant and equipment, gross
Property, Plant and Equipment, Gross Excluding Construction In-Progress
Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Does not include construction in progress.
Threshold period past due accounts receivable reviewed
Threshold Period Past Due Accounts Receivable Reviewed
Threshold Period Past Due Accounts Receivable Reviewed
Schedule Of Deferred Tax Assets And Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Limited partners' distribution declared on common units
Distribution
Distributed Earnings
Commitments and contingencies (Note 16)
Commitments and Contingencies
Limited Partners' Capital Account, Class [Domain]
Limited Partners' Capital Account, Class [Domain]
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Auditor [Abstract]
Auditor [Abstract]
Entity Small Business
Entity Small Business
Units outstanding
Limited Partners' Capital Account, Units Outstanding
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Noncontrolling Interest in OpCo
Noncontrolling Interest [Member]
Accrued maintenance expense
Accrued Maintenance Expense, Current
Accrued Maintenance Expense, Current
Turnaround costs
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs
State and local
Current State and Local Tax Expense (Benefit)
Document Transition Report
Document Transition Report
Long-term Purchase Commitment, Excess Production Percentage
Long-term Purchase Commitment, Excess Production Percentage
Long-term Purchase Commitment, Excess Production Percentage
Number of common carrier pipelines
Number of Common Carrier Pipelines
Number of Common Carrier Pipelines
Underlying Securities
Award Underlying Securities Amount
Equity Component [Domain]
Equity Component [Domain]
Statement of Partners' Capital [Abstract]
Statement of Partners' Capital [Abstract]
Document Period End Date
Document Period End Date
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Quarterly distribution per unit threshold (usd per share)
Incentive Distribution, Quarterly Distribution Per Unit, Distribution Threshold
Incentive Distribution, Quarterly Distribution Per Unit, Distribution Threshold
Income Taxes
Income Tax Disclosure [Text Block]
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Document Type
Document Type
Distributions and Net Income Per Limited Partner Unit
Earnings Per Share [Text Block]
Name
Outstanding Recovery, Individual Name
Operating lease, rental amount
Operating Leases, Rent Expense
Net co-products, ethylene and other sales—third parties
Net sales
Revenue from Contract with Customer, Excluding Assessed Tax
All Individuals
All Individuals [Member]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Additions to property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Name
Forgone Recovery, Individual Name
Minimum quarterly distribution per unit (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
Total current assets
Assets, Current
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
Accrued Liabilities
Accrued Liabilities [Member]
Common units
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Site lease agreement, number
Site lease agreement, number
Site lease agreement, number
Schedule of Other Assets
Schedule of Other Assets [Table Text Block]
Term of Investment Management Agreement with Related Party, Maximum
Term of Investment Management Agreement with Related Party, Maximum
Term of Investment Management Agreement with Related Party, Maximum
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Exchange Agreement
Exchange Agreement [Member]
Exchange Agreement
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Intangible Asset, Finite-Lived [Table]
Intangible Asset, Finite-Lived [Table]
Current liabilities
Liabilities, Current [Abstract]
Deferred charges and other assets and others, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Organization, Consolidation, And Presentation Of Financial Statements [Table]
Organization, Consolidation, And Presentation Of Financial Statements [Table]
Organization, Consolidation, And Presentation Of Financial Statements [Table]
Other Assets [Abstract]
Other Assets [Abstract]
Partner Type of Partners' Capital Account, Name [Domain]
Partner Type of Partners' Capital Account, Name [Domain]
Common units
Common Units [Member]
Common Units [Member]
Accrued and other liabilities
Increase (Decrease) in Accrued Liabilities
Related Party Transaction [Table]
Related Party Transaction [Table]
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Accounts receivable, net—Westlake
Accounts Receivable, after Allowance for Credit Loss, Current
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Title of 12(b) Security
Title of 12(b) Security
Total equity
Equity, beginning balance
Equity, ending balance
Partners' Capital, Including Portion Attributable to Noncontrolling Interest
Impairment Of Long-Lived Assets and Intangible Assets
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]
Agreements with Westlake and Related Parties
Agreements with Westlake and Related Parties [Text Block]
Agreements with Westlake and Related Parties [Text Block]
Earnings Per Share [Abstract]
Earnings Per Share [Abstract]
Consolidation Items [Domain]
Consolidation Items [Domain]
Other income, net
Nonoperating Income (Expense)
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
Auditor Location
Auditor Location
Gross profit
Gross Profit
Other Comprehensive Income
Comprehensive Income, Policy [Policy Text Block]
Distributions to unitholders
Distribution Made to Limited Partner, Cash Distributions Paid
Award Timing Disclosures [Line Items]
Schedule Of Inventory
Schedule of Inventory, Current [Table Text Block]
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Property, Plant and Equipment
Property, Plant and Equipment Disclosure [Text Block]
Partners' Equity
Equity [Text Block]
Partner Type [Axis]
Partner Type [Axis]
State and local
Deferred State and Local Income Tax Expense (Benefit)
Distribution to noncontrolling interest retained in OpCo by Westlake
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income
Limited partners' interest in net income subsequent to IPO
Net Income (Loss) Attributable to Parent
Distributions [Table]
Subsequent Event [Table]
Long-term Purchase Commitment, Compliance Surcharge Amount
Long-term Purchase Commitment, Compliance Surcharge Amount
Long-term Purchase Commitment, Compliance Surcharge
Expiration Date
Trading Arrangement Expiration Date
Alternate Base Rate
Alternate Base Rate [Member]
Alternate Base Rate
Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Property, plant and equipment, net
Property, plant and equipment, net
Property, Plant and Equipment, Net
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Adoption Date
Trading Arrangement Adoption Date
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Inventories
Inventory, Policy [Policy Text Block]
Entity Current Reporting Status
Entity Current Reporting Status
Term of operating lease
Lessee, Operating Lease, Term of Contract
Customer [Axis]
Customer [Axis]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Income from operations
Operating Income (Loss)
Line of Credit
Line of Credit [Member]
Provision for federal income tax, at statutory rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]
Executive Category:
Executive Category [Axis]
Distributions declared with respect to the incentive distribution rights
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.
State income tax provision, net of federal income tax effect (1)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Limited Liability Company
Limited Liability Company [Member]
Partnership's ownership interest (percent)
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest
Current Fiscal Year End Date
Current Fiscal Year End Date
Environmental Costs
Environmental Costs, Policy [Policy Text Block]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Minimum percentage required to be purchased
Long-term Purchase Commitment, Minimum Percentage Required
Long-term Purchase Commitment, Minimum Percentage Required
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
Schedule Of Accounts Receivable
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Total units available for grant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Statement [Table]
Statement [Table]
Adjustments to reconcile net income to net cash provided by operating activities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Cash flows from financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Revenue Benchmark
Revenue Benchmark [Member]
Repayment of debt payable to Westlake
Repayments of Related Party Debt
Publicly and Privately Held
Unidentified Third Parties [Member]
Unidentified Third Parties [Member]
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts receivable, net—third parties
Accounts receivable, net—third parties
Receivables, Net, Current
Variable Rate [Domain]
Variable Rate [Domain]
Description of Business and Significant Accounting Policies
Business Description and Accounting Policies [Text Block]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Amendment Flag
Amendment Flag
Number of units authorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Number of lease agreements
Lessee Leasing Arrangements, Operating Leases, Number
Lessee Leasing Arrangement, Operating Leases, Number
Termination Date
Trading Arrangement Termination Date
Net cash used for financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Unitholders
Unit Holders [Member]
Unit Holders [Member]
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Accrued Liabilities
Accrued Liabilities [Abstract]
Weighted Average Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Measure:
Measure [Axis]
Maximum consolidated leverage ratio during one year following acquisitions
Maximum Consolidated Leverage Ratio During One Year Following Acquisitions
Represents the consolidated leverage ratio required per the debt agreement during any one-year period following certain acquisitions.
Long-Lived Tangible Asset [Domain]
Long-Lived Tangible Asset [Domain]
Cost of sales
Cost of sales
Cost of Product and Service Sold
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Segment Reporting [Abstract]
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Operating lease expense
Operating Lease, Expense
Partners' capital account, units, sold to related party
Partners' Capital Account, Units, Sold to Related Party
Partners' Capital Account, Units, Sold to Related Party
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Other income (expense)
Nonoperating Income (Expense) [Abstract]
Entity Tax Identification Number
Entity Tax Identification Number
Inventory, Net [Abstract]
Inventory, Net [Abstract]
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Use Of Estimates
Use of Estimates, Policy [Policy Text Block]
Entity Public Float
Entity Public Float
Site lease expense
Site lease expense
Site lease expense
Construction in progress
Construction in Progress, Gross
Interest expense—Westlake
Interest expense—Westlake
Interest Expense, Nonoperating
Trading Arrangement:
Trading Arrangement [Axis]
Total Shareholder Return Amount
Total Shareholder Return Amount
Diluted units
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted
Insider Trading Arrangements [Line Items]
Corporate
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Security Exchange Name
Security Exchange Name
Number of Units
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Long-Term Debt
Related Party Transactions, Long-term Debt [Text Block]
Related Party Transactions, Long-term Debt [Text Block]
Total liabilities
Liabilities
Common and Subordinated units
Common And Subordinated Units [Member]
Common And Subordinated Units [Member]
Limited Partners' Capital Account [Line Items]
Limited Partners' Capital Account [Line Items]
Distributions to noncontrolling interest retained in OpCo by Westlake
Payments of Ordinary Dividends, Noncontrolling Interest
Capital expenditures incurred but not yet paid
Capital Expenditures Incurred but Not yet Paid
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
OpCo Revolver
OpCo Revolver [Member]
OpCo Revolver [Member]
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Phantom Share Units (PSUs)
Phantom Share Units (PSUs) [Member]
Partners units, maximum aggregate offering amount, ATM
Partners Units, Maximum Aggregate Offering Amount, ATM
Partners Units, Maximum Aggregate Offering Amount, ATM
Statement [Line Items]
Statement [Line Items]
Consolidation Items [Axis]
Consolidation Items [Axis]
Kentucky
KENTUCKY
Variable Rate [Axis]
Variable Rate [Axis]
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Cash and cash equivalents
Cash and Cash Equivalent
General partner—Westlake
General Partners' Capital Account
Counterparty Name [Axis]
Counterparty Name [Axis]
Distributions [Line Items]
Subsequent Event [Line Items]
Distribution Type [Domain]
Distribution Type [Domain]
Vested (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Westlake Chemical Corporation
Westlake Chemical Corporation [Member]
Westlake Chemical Corporation
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Non-NEOs
Non-NEOs [Member]
Net decrease in cash and cash equivalents
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation