Consolidated Balance Sheets (Parenthetical) - Common units - shares	Sep. 30, 2026	Dec. 31, 2025
Publicly and Privately Held
Units issued (in shares)	21,131,157	21,123,649
Units outstanding (in shares)	21,131,157	21,123,649
Westlake
Units issued (in shares)	14,122,230	14,122,230
Units outstanding (in shares)	14,122,230	14,122,230

The number of limited partner units outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-8

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant