Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)		12 Months Ended
	Nov. 17, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Reserves for potential refund		$ 0	$ 0
Deferred revenue, current		13,900,000	6,200,000
Asset retirement obligation		1,400,000	1,300,000
Accretion expense		100,000	100,000	$ 100,000
Asset impairments		0	0	0
Clean-up costs incurred		0	0	$ 3,000,000
Clean-up costs accrued		$ 0	$ 0
Potentially dilutive units outstanding (in units)		0	0
Pecten
Schedule of Equity Method Investments [Line Items]
Minority interest ownership percentage by parent		100.00%
Ownership interest (in percentage)	100.00%	100.00%
Zydeco
Schedule of Equity Method Investments [Line Items]
Minority interest ownership percentage by parent		92.50%
Minority interest ownership percentage by noncontrolling owners		7.50%