Unit-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	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	$ 423	$ 278	$ 284
Number of Units
Beginning balance	18,564
Granted (in shares)	14,646
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period	18,564
Ending balance	14,646	18,564
Weighted Average Fair Value
Weighted Average Fair Value, beginning balance (usd per share)	$ 21.65
Weighted Average Grant Date Fair Value, Granted (usd per share)	22.69
Weighted Average Grant Date Fair Value, Vested (usd per share)	22.80
Weighted Average Fair Value, ending balance (usd per share)	$ 23.14	$ 21.65
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	1,192,349
Unrecognized compensation cost	$ 201
Westlake Chemical Partners LP Long-Term Incentive Plan | Selling, General and Administrative Expenses
Weighted Average Fair Value
Total compensation cost	$ 373	$ 349	$ 282