Related-Party Transactions - Common Units Issued to Circle K as Consideration for Amounts Due Under the Terms of the Amended Omnibus Agreement (Details) - shares	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Common Units Issued To C S T As Consideration For Amounts Due Under Terms Of Amended Omnibus Agreement [Abstract]
Date of Issuance	May 21, 2018	Mar. 01, 2018
Number of Common Units Issued	155,236	136,882

Date of maturity, expiration or mandatory redemption of the financial or equity instrument issued as noncash or part noncash consideration for a business or asset acquired, in CCYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Name:	us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationDueDateDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration