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.

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

Related Party Transactions - Noncontrolling Interest (Details)	Dec. 31, 2016	May 31, 2016	Dec. 31, 2015	May 31, 2015	Nov. 03, 2014
Zydeco
Related Party Transaction [Line Items]
Noncontrolling Interest	7.50%	7.50%	37.50%	37.50%	57.00%