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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
OpCo sells a significant portion of its ethylene production to Westlake. Sales to related parties were as follows:
Year Ended December 31,
202420232022
Net sales—Westlake$950,801 $1,026,655 $1,342,910 
A significant portion of the Partnership's inputs included in cost of sales are supplied by Westlake. Charges from related parties for significant inputs included in cost of sales were as follows:
Year Ended December 31,
202420232022
Feedstock purchased from Westlake and included in cost of sales$310,856 $398,700 $764,123 
Other charges from Westlake and included in cost of sales125,702 123,039 172,761 
Charges from related parties included within selling, general and administrative expenses were as follows:
Year Ended December 31,
202420232022
Services received from Westlake and included in selling, general and
   administrative expenses		$25,654 $27,085 $26,621 
Charges from related parties for goods and services capitalized as assets were as follows:
Year Ended December 31,
202420232022
Goods and services purchased from Westlake and capitalized as assets$2,295 $3,660 $2,852 
The Partnership's receivable under the Investment Management Agreement was as follows:
December 31,
20242023
Receivable under the Investment Management Agreement$134,557 $94,444 
The Partnership's accounts receivable from Westlake were as follows:
December 31,
20242023
Accounts receivable—Westlake$31,975 $49,565 
December 31,
20242023
Accounts payable—Westlake$20,744 $15,166 
Debt payable to related parties was as follows:
December 31,
20242023
Long-term debt payable to Westlake$399,674 $399,674