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Unit-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jul. 15, 2014
Weighted Average Fair Value
Unrecognized compensation weighted average remaining term	7 months 6 days
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of phantom units vested	$ 322	$ 423	$ 278
Number of Units
Beginning balance	14,646
Granted (in shares)	15,015
Vested (in shares)	(14,646)
Ending balance	15,015	14,646
Weighted Average Fair Value
Weighted Average Fair Value, beginning balance (usd per share)	$ 23.14
Weighted Average Grant Date Fair Value, Granted (usd per share)	21.92
Weighted Average Grant Date Fair Value, Vested (usd per share)	21.96
Weighted Average Fair Value, ending balance (usd per share)	$ 19.00	$ 23.14
Westlake Chemical Partners LP Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units authorized				1,270,000
Weighted Average Fair Value
Total units available for grant	1,184,657
Unrecognized compensation cost	$ 169
Westlake Chemical Partners LP Long-Term Incentive Plan | Selling, General and Administrative Expenses
Weighted Average Fair Value
Total compensation cost	$ 301	$ 373	$ 349

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