Statement of Comprehensive Income [Abstract] Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments in fair value of cash flow hedge Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Reclassification of losses to net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interest in OpCo Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to Westlake Chemical Partners LP susequent to initial public offering Comprehensive Income (Loss), Net of Tax, Attributable to Parent Investments, Debt and Equity Securities [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Predecessor [Member] Predecessor [Member] Entity Information [Line Items] Entity Information [Line Items] Federal Current Federal Tax Expense (Benefit) State and local Current State and Local Tax Expense (Benefit) Total Current Current Income Tax Expense (Benefit) Federal Deferred Federal Income Tax Expense (Benefit) State and local Deferred State and Local Income Tax Expense (Benefit) Total deferred Deferred Income Tax Expense (Benefit) Total provision Income Tax Expense (Benefit) Quarterly Financial Information Disclosure [Abstract] Statement [Table] Statement [Table] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class [Domain] Common units [Member] Common Units [Member] Common Units [Member] Subordinated units [Member] Subordinated Units [Member] Subordinated Units [Member] Statement [Line Items] Statement [Line Items] Net sales Revenue, Net Gross profit Gross Profit Income from operations Operating Income (Loss) Net income Net Income (Loss) Attributable to Parent Basic and diluted earnings per common unit holder (usd per unit) Earnings Per Share, Basic and Diluted Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Affiliated Entity [Member] Affiliated Entity [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Westlake [Member] Parent Company And Subsidiaries, Excluding Reporting Entity And Subsidiaries [Member] Parent Company and Subsidiaries, Excluding Reporting Entity and Subsidiaries [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Feedstock purchased from Westlake and included in cost of sales Related Parties Amount In Cost Of Sales, Feedstock Purchased Related Parties Amount In Cost Of Sales, Feedstock Purchased Other charges from Westlake and included in cost of sales Cost Of Goods Sold, Other Cost Of Goods Sold, Other Cost of sales Cost of Goods Sold Organization, Consolidation and Presentation of Financial Statements [Abstract] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] 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. Debt Disclosure [Abstract] Weslake [Member] Westlake Chemical OpCo LP [Member] Westlake Chemical OpCo LP [Member] Westlake Chemical OpCo LP [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Limited Partner [Member] Limited Partner [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes [Member] Senior Notes [Member] Line of Credit [Member] Line of Credit [Member] Senior Unsecured Revolving Credit Facility [Member] Senior Unsecured Revolving Credit Facility [Member] Senior Unsecured Revolving Credit Facility [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2013 Promissory Note [Member] Promissory Notes, 2013 [Member] Promissory Notes, 2013 [Member] OpCo Revolver [Member] OpCo Revolver [Member] OpCo Revolver [Member] MLP Revolver [Member] MLP Revolver [Member] MLP Revolver [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Prime Rate [Member] Prime Rate [Member] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Long-term debt Due to Related Parties, Noncurrent Basis spread on variable rate, percent Debt Instrument, Basis Spread on Variable Rate Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Additional ownership interest 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 Amount paid to purchase additional limited partner interest Payments to Acquire Limited Partnership Interests 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. 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 Weighted average interest rate on all long-term debt Long-term Debt, Weighted Average Interest Rate Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Interest Rate Contract [Member] Interest Rate Contract [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Interest Rate Derivative Assets, at Fair Value Interest Rate Derivative Assets, at Fair Value Derivative Instruments and Hedges, Assets [Abstract] Derivative [Table] Derivative [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Value Hedging [Member] Fair Value Hedging [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Fair Value Hedges [Member] Designated as Hedging Instrument [Member] Derivatives Not Designated As Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Commodity forward contracts [Member] Commodity Forward Contracts [Member] Commodity forward contracts [Member] Firm Commitment Derivative Items Designated As Hedged Item [Member] Firm Commitment Derivative Items Designated As Hedged Item [Member] Firm Commitment Derivative Items Designated as Hedged Item [Member] Derivative [Line Items] Derivative [Line Items] Gain (Loss) Recognized in Income on Derivative Derivative, Gain (Loss) on Derivative, Net Number of contracts Derivative, Number of Instruments Held Ineffective portion of a derivative instrument Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Investee [Member] Investee [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Reimbursement to Parent for State Tax [Member] Reimbursement to Parent for State Tax [Member] Reimbursement to Parent for State Tax [Member] Site Lease Agreement [Member] Site Lease Agreement [Member] Site Lease Agreement [Member] Outstanding letters of credit Letters of Credit Outstanding, Amount Outstanding debt Long-term Debt Unamortized discount on senior notes Debt Instrument, Unamortized Discount Income Taxes Paid Income Taxes Paid Number of lease agreements Lessee Leasing Arrangements, Operating Leases, Number Lessee Leasing Arrangement, Operating Leases, Number Term of operating lease Lessee Leasing Arrangements, Operating Leases, Term of Contract Operating lease, rental amount Operating Leases, Rent Expense Equity [Abstract] Initial Public Offering and Purchase of Additional Interests Stockholders' Equity Note Disclosure [Text Block] Accounts Receivable, Net [Abstract] Accounts Receivable—Third Parties Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule Of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement of Partners' Capital [Abstract] Public [Member] Unidentified Third Parties [Member] Unidentified Third Parties [Member] Partner Type [Axis] Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] General Partner [Member] General Partner [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Noncontrolling Interest in OpCo [Member] Noncontrolling Interest [Member] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Equity, beginning balance Partners' Capital, Including Portion Attributable to Noncontrolling Interest Contribution of debt payable to Westlake into net investment Partners' Capital Account, Contributions Net income Net distributions to Westlake Partners' Capital Account, Distributions Predecessor net liabilities not assumed by OpCo Partners' Capital, Predecessor Net Liabilities Not Assumed By Subsidiary Partners' Capital, Predecessor Net Liabilities Not Assumed By Subsidiary Allocation of net investment to unitholders Partners' Capital Allocation Of Net Investment To Unitholders Partners' Capital Allocation Of Net Investment To Unitholders Proceeds from initial public offering, net of finance and other offering costs Partners' Capital Account, Public Sale of Units Distribution to the noncontrolling interest in OpCo Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders, Reimbursement Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders, Reimbursement Purchase of additional interest in OpCo Noncontrolling Interest, Increase from Subsidiary Equity Issuance Net effect of cash flow hedge Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Limited Partners' Capital Account, Distribution Amount Limited Partners' Capital Account, Distribution Amount Quarterly distribution for the period from August 4, 2014 to September 30, 2014 to noncontrolling interest retained in OpCo by Westlake Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Equity, ending balance Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Year Valuation Allowances and Reserves, Balance Charged to Expense Valuation Allowances and Reserves, Charged to Cost and Expense Additions/ (Deductions) Valuation Allowances and Reserves, Deductions Balance at End of Year Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Future Minimum Lease Commitments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Other Assets [Abstract] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Schedule Of Finite-Lived And Indefinite-Lived Intangible Assets [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Schedule of Finite-Lived And Indefinite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived And Indefinite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line items] Goodwill, Cost Goodwill, Gross Goodwill, Net Goodwill Interest Rate Contract, Gross Interest Rate Contract, Gross Interest Rate Contract, Gross Schedule Of Other Assets [Table] Schedule Of Other Assets [Table] Schedule Of Other Assets [Table] Other Assets, Noncurrent [Axis] Other Assets, Noncurrent [Axis] Other Assets, Noncurrent [Axis] Other Assets Noncurrent By Type [Domain] Other Assets Noncurrent By Type [Domain] Other Assets, Noncurrent, By Type [Domain] Deferred Turnaround Costs [Member] Deferred Turnaround Costs [Member] Deferred Turnaround Costs [Member] Other Amortizable Assets [Member] Other Amortizable Assets [Member] Other Amortizable Assets [Member] Other Assets [Line Items] Other Assets [Line Items] Other Assets [Line Items] Interest rate contract Interest Rate Contract, Net Interest Rate Contract, Net Turnaround costs, Cost Turnaround Costs, Gross Turnaround Costs, Gross Turnaround costs, Accumulated Amortization Accumulated Amortization, Turnaround Costs Accumulated Amortization, Turnaround Costs Turnaround costs, Net Turnaround Costs, Net Turnaround Costs, Net Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Other, Costs Noncurrent Assets, Other, Gross Noncurrent Assets, Other, Gross Other, Accumulated Amortization Accumulated Amortization, Noncurrent Assets, Other Accumulated Amortization, Noncurrent Assets, Other Other, Net Noncurrent Assets, Other, Net Noncurrent Assets, Other, Net Total deferred charges and other assets, Cost Total Deferred Charges and Other Assets, Noncurrent, Gross Total Deferred Charges and Other Assets, Noncurrent, Gross Total deferred charges and other assets, Accumulated Amortization Accumulated Amortization, Total Deferred Charges and Other Assets, NonCurrent Accumulated Amortization, Total Deferred Charges and Other Assets, NonCurrent Total deferred charges and other assets, Net Total Deferred Charges and Other Assets, NonCurrent, Net Total Deferred Charges and Other Assets, NonCurrent, Net Other assets, Cost Other Assets, Noncurrent, Gross Represents the gross amount (cost) of a specified group of non-current assets. Other assets, Accumulated Amortization Other Assets, Noncurrent, Accumulated Amortization Represents the accumulated amortization of a specified group of non-current assets. Total other assets, net Other Assets, Noncurrent Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Interest incurred, added to principal on promissory notes outstanding Interest Incurred, Added to Debt Outstanding Interest Incurred, Added to Debt Outstanding Reduction in capital expenditure accrual Increase (Decrease) in Capital Expenditure Accrual Increase (Decrease) in Capital Expenditure Accrual Related party notes payable deemed settled through net investment Increase (Decrease) in Notes Payable, Related Parties Cash transferred in related party notes payable settlement Cash Transferred In Notes Payable Settlement, Related Parties Cash Transferred In Notes Payable Settlement, Related Parties Interest Paid, Net Interest Paid, Net Schedule II - Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Westlake Chemical Partners LP Long-Term Incentive Plan [Member] Westlake Chemical Partners LP Long-Term Incentive Plan [Member] Westlake Chemical Partners LP Long-Term Incentive Plan [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Phantom Share Units (PSUs) [Member] Phantom Share Units (PSUs) [Member] DERs [Member] Distribution Equivalent Rights (DERs) [Member] Distribution Equivalent Rights (DERs) [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of units authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of units granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Total units available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Total compensation cost Allocated Share-based Compensation Expense Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Balance at end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Interest rate contract - Other comprehensive income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Interest rate contract - Amounts reclassified to net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Organization, Consolidation, And Presentation Of Financial Statements [Table] Organization, Consolidation, And Presentation Of Financial Statements [Table] Organization, Consolidation, And Presentation Of Financial Statements [Table] Limited Liability Company [Member] Limited Liability Company [Member] Majority-Owned Subsidiary, Unconsolidated [Member] Majority-Owned Subsidiary, Unconsolidated [Member] Westlake Chemical OpCo GP LLC [Member] Westlake Chemical OpCo GP LLC [Member] Westlake Chemical OpCo GP LLC [Member] 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]. Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Number of units sold in public offering Partners' Capital Account, Units, Sold in Public Offering Partnership's ownership interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Additional ownership interest acquired Payments to Acquire Limited Partnership Interests Number of Production Facilities Number of Production Facilities Number of Production Facilities Threshold period past due accounts receivable reviewed Threshold Period Past Due Accounts Receivable Reviewed Threshold Period Past Due Accounts Receivable Reviewed Capitalized interest Interest Costs Capitalized Goodwill Amortization period, minimum (in years) Plant And Equipment Planned Major Maintenance Activities Amortization Period Minimum The minimum amortization period of planned major maintenance activities. Amortization period, maximum (in years) Plant And Equipment Planned Major Maintenance Activities Amortization Period Maximum The maximum amortization period of planned major maintenance activities. Other assets amortization period, minimum (in years) Finite Lived Intangible Assets Amortization Period Minimum The minimum amortization period of finite-lived intangible assets. Other assets amortization period, maximum (in years) Finite Lived Intangible Assets Amortization Period Maximum The maximum amortization period of finite-lived intangible assets. Schedule of Incentive Distribution Made to Managing Member or General Partner [Table] Schedule of Incentive Distribution Made to Managing Member or General Partner [Table] Distribution Type [Axis] Distribution Type [Axis] Distribution Type [Domain] Distribution Type [Domain] Cash Distribution [Member] Cash Distribution [Member] Above $0.3163 up to $0.3438 Cash Distribution, Tranche One [Member] Cash Distribution, Tranche One [Member] Above $0.3438 up to $0.4125 Cash Distribution, Tranche Two [Member] Cash Distribution, Tranche Two [Member] Above $0.4125 Cash Distribution, Tranche Three [Member] Cash Distribution, Tranche Three [Member] Managing Member or General Partner [Axis] Managing Member or General Partner [Axis] Incentive Distribution, Recipient [Domain] Incentive Distribution, Recipient [Domain] Unit Holders [Member] Unit Holders [Member] Unit Holders [Member] IDR Holders [Member] Incentive Distribution Made to Managing Member or General Partner [Line Items] Incentive Distribution Made to Managing Member or General Partner [Line Items] Marginal Percentage Interest in Distributions Incentive Distribution, Marginal Percentage Interest in Distributions Incentive Distribution, Marginal Percentage Interest in Distributions Incentive Distribution, Quarterly Distribution Per Unit, In Excess Of Minimum Incentive Distribution, Quarterly Distribution Per Unit, Distribution Threshold Incentive Distribution, Quarterly Distribution Per Unit, Distribution Threshold Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution [Table Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Long-Term Debt Related Party Transactions, Long-term Debt [Text Block] Related Party Transactions, Long-term Debt [Text Block] Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Supplemental Information Other Income and Other Expense Disclosure [Text Block] Description Of Business Description Of Business [Policy Text Block] Description Of Business [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Cash And Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Allowance For Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Impairment Of Long-Lived Assets and Intangible Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Turnaround Costs Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block] Exchanges Inventory Exchange [Policy Text Block] Disclosure of accounting policy for the basis and manner that goods are exchanged and settled in like-kind quantities. This disclosure includes the nature of the cost elements included in inventory and how cost is determined (such as FIFO, LIFO, average). Concentration Of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Revenue Recognition Revenue Recognition Accounting Policy, Gross and Net Revenue Disclosure [Policy Text Block] Net Income per Unit Earnings Per Share, Policy [Policy Text Block] Derivative Instruments Derivatives, Policy [Policy Text Block] Environmental Costs Environmental Costs, Policy [Policy Text Block] Fair Value Of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Use Of Estimates Use of Estimates, Policy [Policy Text Block] Net Investment Net Investment [Policy Text Block] Net Investment [Policy Text Block] Other Assets Other Assets [Policy Text Block] Disclosure of accounting policy for the method of amortizing debt issuance costs and certain other assets. Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Schedule of Limited Partners' Capital Account by Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Westlake [Member] Subsidiary, Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock, Name of Transaction [Domain] Sale of Stock [Domain] Over-Allotment Option [Member] Over-Allotment Option [Member] IPO [Member] IPO [Member] Loans Payable [Member] Loans Payable [Member] Preformation Capital Expenditure [Member] Preformation Capital Expenditure [Member] Preformation Capital Expenditure [Member] Cash Reserve Turnaround [Member] Cash Reserve Turnaround [Member] Cash Reserve Turnaround [Member] Intercompany Debt [Member] Intercompany Debt [Member] Intercompany Debt [Member] Ethylene Sales Agreement [Member] Ethylene Sales Agreement [Member] Ethylene Sales Agreement [Member] Excess Production Option [Member] Excess Production Option [Member] Excess Production Option [Member] Feedstock Supply Agreement [Member] Feedstock Supply Agreement [Member] Feedstock Supply Agreement [Member] Services And Secondment Agreement [Member] Services And Secondment Agreement [Member] Services And Secondment Agreement [Member] Investor [Member] Investor [Member] Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Debt assumed by acquiree Intercompany Debt Intercompany Debt Price per unit Sale of Unit, Price Per Unit Sale of Unit, Price Per Unit Price per unit, net of underwriting discount Sale of Unit, Price Per Unit, Net of Underwriting Discount Sale of Unit, Price Per Unit, Net of Underwriting Discount Units outstanding Limited Partners' Capital Account, Units Outstanding Net proceeds from issuance of common units Proceeds from Issuance of Common Limited Partners Units Payments of unit issuance costs Payments of Unit Issuance Costs Payments of Unit Issuance Costs Carrying value of additional partnership interest purchased Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Excess cash paid over carrying value of partnership interest Noncontrolling Interest, Decrease Due To Excess Cash Paid Over Carrying Value Noncontrolling Interest, Decrease Due To Excess Cash Paid Over Carrying Value Capital expenditures Pre-formation Capital Expenditures Pre-formation Capital Expenditures Use of proceeds from public offering Subsidiary Initial Public Offering, Use Of Proceeds Subsidiary Initial Public Offering, Use Of Proceeds Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Term of sales agreement Long-term Purchase Commitment, Period Minimum percentage required to be purchased Long-term Purchase Commitment, Minimum Percentage Required Long-term Purchase Commitment, Minimum Percentage Required Maximum mass required to be purchased Long-term Purchase Commitment, Maximum Volume Required Long-term Purchase Commitment, Maximum Volume Required Percentage of excess production that can be purchased Long-term Purchase Commitment, Option To Purchase Excess Production, Percentage Long-term Purchase Commitment, Option To Purchase Excess Production, Percentage 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 Purchase commitment, fixed margin on variable pricing Long-term Purchase Commitment, Fixed Margin Long-term Purchase Commitment, Fixed Margin Purchase commitment, renewal term Long-term Purchase Commitment, Renewal Term Long-term Purchase Commitment, Renewal Term Related party transactions, term of agreements Related Party Transaction, Term Of Agreement Related Party Transaction, Term Of Agreement 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 Earnings Per Share [Abstract] Subsequent Event [Table] Subsequent Event [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Distribution declared per unit Distribution Made to Limited Partner, Distributions Declared, Per Unit Distribution declared Distribution Made to Limited Partner, Cash Distributions Declared Document And Entity Information [Abstract] Document And Entity Information (Abstract) Document Information [Table] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Document Information [Line Items] Document Information [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Common Stock, Shares Outstanding Entity Public Float Accounts receivable, net—Westlake Accounts Receivable, Related Parties, Current Accounts payable—Westlake Accounts Payable, Related Parties, Current Distribution declared Distributed Earnings Net income subsequent to the IPO in excess of distribution Undistributed Earnings, Basic Limited partners' interest in net income subsequent to IPO Distribution Made to Limited Partner, Distributions Paid, Per Unit Distribution Made to Limited Partner, Distributions Paid, Per Unit Inventory, Net [Abstract] Schedule Of Inventory Schedule of Inventory, Current [Table Text Block] Other Assets Other Assets Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] 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] Depreciation and amortization Depreciation, Depletion and Amortization Provision for doubtful accounts Provision for Doubtful Accounts Loss from disposition of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Deferred income taxes Income from equity method investment, net of dividends Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Changes in operating assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Accounts receivable - third parties Increase (Decrease) in Accounts and Other Receivables Net accounts receivable - Westlake Increase (Decrease) in Accounts Receivable, Related Parties Inventories Increase (Decrease) in Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Expenses And Other Current Assets The increase (decrease) during the reporting period in the aggregate value of prepaid expenses and other current assets. Accounts payable Increase (Decrease) in Accounts Payable Accrued and other liabilities Increase (Decrease) in Accrued Liabilities Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Settlements of derivative instruments Payments for (Proceeds from) Derivative Instrument, Investing Activities Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from debt payable to Westlake Proceeds from Related Party Debt Repayment of debt payable to Westlake Repayments of Related Party Debt Quarterly distributions to noncontrolling interest retained in OpCo by Westlake Payments to Noncontrolling Interests Quarterly distributions to unitholders Distribution Made to Limited Partner, Cash Distributions Paid Repayment of related party debt with proceeds from the initial public offering Repayment of related party debt with proceeds from the initial public offering Repayment of related party debt with proceeds from the initial public offering Proceeds from initial public offering distributed to Westlake Payments of Capital Distribution Net distributions to Westlake prior to initial public offering Payments of Distributions to Affiliates Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Services received from Westlake and included in selling, general and administrative expenses Selling, General and Administrative Expense Provision for federal income tax, at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax provision, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Partnership income not subject to entity-level tax Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Manufacturing deduction Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Other, net Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Provision for income taxes Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Statement of Financial Position [Abstract] Units issued Limited Partners' Capital Account, Units Issued Property, Plant and Equipment, Net [Abstract] Schedule Of Property, Plant And Equipment Property, Plant and Equipment [Table Text Block] Other Nonoperating Income (Expense) [Member] Other Nonoperating Income (Expense) [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued Liabilities [Member] Accrued Liabilities [Member] Interest on related party debt payable Interest Expense, Related Party Interest capitalized Accrued interest on related party debt Interest Payable, Current Accrued interest Interest Payable, Noncurrent Interest Payable, Noncurrent Long-term debt payable to Westlake Trade customers Accounts Receivable, Gross, Current Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Trade Customer Receivable Net Current Trade Customer Receivable Net Current Trade Customer Receivable Net Current Other Receivables, Net, Current Other Receivables, Net, Current Accounts receivable, net—third parties Receivables, Net, Current 2016 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2017 Operating Leases, Future Minimum Payments, Due in Two Years 2018 Operating Leases, Future Minimum Payments, Due in Three Years 2019 Operating Leases, Future Minimum Payments, Due in Four Years 2020 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease commitments Operating Leases, Future Minimum Payments Due Approximate rental expense Operating Leases, Rent Expense, Net Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Net sales [Member] Sales Revenue, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage Schedule Of Other Assets Schedule of Other Assets, Noncurrent [Table Text Block] Accrued liabilities Accrued Liabilities, Current Net sales - Westlake Revenue from Related Parties Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Building and improvements Buildings and Improvements, Gross Plant and equipment Machinery and Equipment, Gross Other Property, Plant and Equipment, Other, Gross 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. Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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. Construction in progress Construction in Progress, Gross Property, plant and equipment, net Property, Plant and Equipment, Net Depreciation expense Depreciation Finished products Inventory, Finished Goods, Gross Feedstock, additives, and chemicals Inventory, Work in Process and Raw Materials Inventories Inventory, Net Buildings And Improvements [Member] Building and Building Improvements [Member] Plant And Equipment [Member] Plant And Equipment [Member] Plant And Equipment [Member] Ethylene Pipeline [Member] Ethylene Pipeline [Member] Ethylene Pipeline [Member] Other [Member] Other Capitalized Property Plant and Equipment [Member] Property, plant and equipment, useful life (in years) Property, Plant and Equipment, Useful Life Schedule Of The Provision For (Benefit From) Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule Of Deferred Tax Assets And Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Designated as Hedging Instrument [Member] Cost of Sales [Member] Cost of Sales [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Federal Property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Turnaround costs Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs Deferred tax liabilities-total Deferred Tax Liabilities, Net Balance sheet classifications Deferred Tax Assets, Net, Classification [Abstract] Noncurrent deferred tax liability Deferred Tax Liabilities, Net, Noncurrent Current Income Tax Expense (Benefit) Federal State and local Deferred Income Tax Expense (Benefit) Property, Plant And Equipment Property, Plant and Equipment Disclosure [Text Block] Unit-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] ASSETS Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net—Westlake Chemical Corporation (Westlake) Accounts receivable, net—third parties Inventories Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Other assets, net Deferred charges and other assets Deferred Costs and Other Assets Total assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable—Westlake Accounts payable—third parties Accounts Payable, Current Accrued liabilities Total current liabilities Liabilities, Current Deferred income taxes Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Notes 9 and 19) Commitments and Contingencies EQUITY Stockholders' Equity Attributable to Parent [Abstract] Limited partners' capital Limited Partners' Capital Account General partner—Westlake General Partners' Capital Account Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Westlake Chemical Partners LP partners' capital Partners' Capital Noncontrolling interest in Westlake Chemical OpCo LP (OpCo) Noncontrolling Interest in Limited Partnerships Total equity Total liabilities and equity Liabilities and Equity Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Income Statement [Abstract] Net co-products, ethylene and feedstock sales—third parties Other Revenue, Net Net sales Gross profit Selling, general and administrative expenses Income from operations Other income (expense) Nonoperating Income (Expense) [Abstract] Interest expense—Westlake Other income, net Nonoperating Income (Expense) Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Income (Loss) from Continuing Operations before Income Taxes Income (Loss) from continuing operations, including the portion attributable to noncontrolling interest, and income (loss) from equity method investments, but before extraordinary items, cumulative effects of changes in accounting principles and income taxes. Net income Less: Net income attributable to noncontrolling interest in OpCo Net Income (Loss) Attributable to Noncontrolling Interest Limited partners' interest in net income subsequent to IPO Net income attributable to Westlake Chemical Partners LP subsequent to initial public offering per limited partner unit (basic and diluted) Earnings Per Share, Basic and Diluted [Abstract] Income per limited partner unit (usd per unit) Weighted average limited partner units outstanding (basic and diluted) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Schedule Of Assets And Liabilities On A Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule Of Carrying And Fair Values Of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Description Of Business And Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Net Income Per Limited Partner Unit Earnings Per Share [Text Block] Goods and services purchased from Westlake and capitalized as assets RelatedPartyTransactionPurchasesFromRelatedPartyCapitalizedAsAssets Related Party Transaction Purchases From Related Party Capitalized As Assets Impact Of Derivative Instruments Designated As Fair Value Hedges Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Impact Of Derivative Instruments Not Designated As Fair Value Hedges Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Fair Values Of Derivative Instruments In Consolidated Balance Sheets Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Polyone [Member] Polyone [Member] PolyOne [Member] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Litigation [Member] Pending Litigation [Member] Threatened Litigation [Member] Threatened Litigation [Member] Settled Litigation [Member] Settled Litigation [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Environmental costs percentage net of recoveries from third parties Environmental Costs Percentage Net Of Recoveries From Third Parties Represents environmental costs percentage, net of recoveries or credits from third parties, to be paid by a counterparty. Costs incurred for environmental remediation services Environmental Remediation Expense Costs sought to be recovered by plaintiffs Loss Contingency, Damages Sought, Value Litigation Settlement, Amount Litigation Settlement, Amount Partners' Equity Partners' Capital Notes Disclosure [Text Block] Inventories Inventory Disclosure [Text Block] Cash Flow Hedging [Member] Cash Flow Hedging [Member] Derivatives, Fair Value, by Balance Sheet Location [Axis] Other Assets [Member] Other Assets [Member] Derivative, Fair Value, Net Derivative, Fair Value, Net Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Interest Expense [Member] Interest Expense [Member] Derivative, Gain (Loss) on Derivative, Net Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion Accrued Liabilities Accrued Liabilities [Abstract] Accrual related to capital expenditures Accrued Capital Expenditures, Current Accrued Capital Expenditures, Current Accrued Maintenance Expense, Current Accrued Maintenance Expense, Current Accrued Maintenance Expense, Current Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Long-term debt, fair value Long-term Debt, Fair Value Limited Partners' Common Units [Member] Limited Partners' Subordinated Units [Member] Distribution Weighted average units outsanding: Basic and diluted (units) Net income per limited partner unit: Amortization expense of other assets Amortization Of Other Assets Amortization of other assets Discounted cash flow projections period Discounted Cash Flow Methodology, Asset Impairment, Number Of Years Forecasted The number of forecast years utilized in developing discounted cash flow projections in determining asset impairment. Rate used to discount future cash flows for goodwill impairment test Discounted Cash Flow Methodology, Goodwill Impairment, Discount Rate The discount rate percentage utilized when developing discounted cash flow projections in determining projected future cash flows as they relate to goodwill impairment. Percentage future cash flows of segment could decrease by and not be impaired Discounted Cash Flow Methodology, Goodwill Impairment, Cash Flow Percentage Decrease Without Impairment Percentage used in the sensitivity analysis of future discounted cash flows analyzed for goodwill impairment under the discounted cash flow methodology. Distributions Made to Limited Partner [Table] Distributions Made to Limited Partner [Table] Common and Subordinated units [Member] Common And Subordinated Units [Member] Common And Subordinated Units [Member] Distribution Made to Limited Partner [Line Items] Distribution Made to Limited Partner [Line Items] Percentage of minimum quarterly distribution partnership must pay to end subordination period Percentage Paid Of Minimum Quarterly Distribution Ending Subordination Period Percentage Paid Of Minimum Quarterly Distribution Ending Subordination Period Minimum quarterly distribution per unit Incentive Distribution Rights, Minimum Quarterly Distribution Per Unit Incentive Distribution Rights, Minimum Quarterly Distribution Per Unit Threshold of distributions per unit to payout additional distributions Incentive Distribution Rights, Threshold To Payout Additional Distributions Incentive Distribution Rights, Threshold To Payout Additional Distributions Schedule of Cash Equivalents [Table] Schedule of Cash and Cash Equivalents [Table] Investments by Category [Axis] Investments by Category [Axis] Marketable Securities and Investments Held at Cost [Domain] Marketable Securities and Investments Held at Cost [Domain] Held-to-maturity securities Held-to-maturity Securities [Member] Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Cash equivalents Cash Equivalents, at Carrying Value Schedule Of Long-Term Debt Schedule of Long-term Debt Instruments [Table Text Block] Summary Of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Major Customer and Concentration of Credit Risk Concentration Risk Disclosure [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]