Summary of Significant Accounting Policies - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Accrued drilling costs	$ 15,457	$ 17,920
Accrued interest payable	11,410	35,461
Accrued transportation costs	5,290	4,632
Accrued employee compensation	3,660	6,045
Accrued ad valorem taxes	750
Accrued lease operating expenses	2,250	2,130
Other	1,688	1,898
Total accrued expenses	$ 40,505	$ 68,086