Related Party Transactions - Terminal Services Agreements (Details)	3 Months Ended
Mar. 31, 2019
Martin Resource Management
Related Party Transaction [Line Items]
Termination written notice, minimum (in days)	60 days

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration