Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Long-Term Debt (Details) - USD ($) $ in Thousands		9 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 07, 2026	Sep. 30, 2026	Dec. 31, 2025
Related Party Transaction [Line Items]
Weighted average interest rate		5.50%	5.80%
Limited Partner \| Senior Unsecured Revolving Credit Facility \| Long-term debt payable to Westlake
Related Party Transaction [Line Items]
Long-term debt payable to Westlake		$ 22,619	$ 22,619
Credit spread adjustment	0.10%
Basis spread on variable rate, percent		1.75%
Limited Partner \| Senior Unsecured Revolving Credit Facility \| MLP Revolver
Related Party Transaction [Line Items]
Long-term debt payable to Westlake		$ 377,055	$ 377,055
Credit spread adjustment	0.10%
Limited Partner \| Senior Unsecured Revolving Credit Facility \| MLP Revolver \| Minimum
Related Party Transaction [Line Items]
Basis spread on variable rate, percent		1.75%
Limited Partner \| Senior Unsecured Revolving Credit Facility \| MLP Revolver \| Maximum
Related Party Transaction [Line Items]
Basis spread on variable rate, percent		2.75%