Related Party Debt - Schedule of Consolidated Related Party Debt Obligations (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Five Year Revolver
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 400,000,000
Borrowing available under credit facility	$ 79,200,000
Interest of unused capacity	0.19%
364 Day Revolver
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 180,000,000
Borrowing available under credit facility	$ 42,600,000
Interest of unused capacity	0.12%
Revolving Credit Facility | Zydeco
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 30,000,000
Borrowing available under credit facility	$ 30,000,000
Interest of unused capacity	0.23%