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Westlake Chemical Partners LP (Details) - $ / shares
3 Months Ended 9 Months Ended
Jul. 27, 2018
Sep. 30, 2018
Sep. 30, 2018
Subsidiary of Common Parent [Member] | Westlake Chemical OpCo LP [Member] | Limited Partner [Member] | IPO [Member]      
Class of Stock [Line Items]      
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest     81.70%
Subsidiary of Common Parent [Member] | Westlake Chemical Partners LP [Member] | Limited Partner [Member] | IPO [Member]      
Class of Stock [Line Items]      
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest     43.80%
Cash Distribution [Member]      
Class of Stock [Line Items]      
Incentive Distribution, Distribution Per Unit $ 1.2938 $ 1.2938  
Unit Holders [Member] | Cash Distribution, Tranche One [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 85.00% 85.00%  
Unit Holders [Member] | Cash Distribution, Tranche Two [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 75.00% 75.00%  
Unit Holders [Member] | Cash Distribution, Tranche Three [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 50.00% 50.00%  
IDR Holders [Member] | Cash Distribution, Tranche One [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 15.00% 15.00%  
IDR Holders [Member] | Cash Distribution, Tranche Two [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 25.00% 25.00%  
IDR Holders [Member] | Cash Distribution, Tranche Three [Member]      
Class of Stock [Line Items]      
Maximum Percentage Of Income Distribution 50.00% 50.00%  
Minimum [Member] | Cash Distribution, Tranche One [Member]      
Class of Stock [Line Items]      
Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders $ 1.2938 $ 0.3163  
Minimum [Member] | Cash Distribution, Tranche Two [Member]      
Class of Stock [Line Items]      
Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders 1.4063 0.3438  
Minimum [Member] | Cash Distribution, Tranche Three [Member]      
Class of Stock [Line Items]      
Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders 1.6875 0.4125  
Maximum [Member] | Cash Distribution, Tranche One [Member]      
Class of Stock [Line Items]      
Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders 1.4063 0.3438  
Maximum [Member] | Cash Distribution, Tranche Two [Member]      
Class of Stock [Line Items]      
Incentive Distribution Rights, Target Distribution Per Unit Requiring Marginal Percentage Distribution to IDR Holders $ 1.6875 $ 0.4125