Summary of Significant Accounting Policies - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Accrued interest	$ 5,685	$ 29,075
Accrued drilling costs	876	5,306
Accrued ad valorem taxes	3,600
Asset retirement obligation of assets held for sale	3,442
Accrued transportation costs	2,466	2,818
Other accrued liabilities	4,329	1,245
Total accrued expenses	$ 20,398	$ 38,444