Consolidated Balance Sheets (Parenthetical) - Common units [Member] - shares	Sep. 30, 2020	Dec. 31, 2019
Publicly and Privately Held [Member]
Units issued	21,072,315	21,072,315
Units outstanding	21,072,315	21,072,315
Westlake [Member]
Units issued	14,122,230	14,122,230
Units outstanding	14,122,230	14,122,230

The number of limited partner units outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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