Summary of Significant Accounting Policies - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Accrued drilling costs	$ 22,129	$ 17,920
Accrued interest payable	32,253	35,461
Accrued transportation costs	6,793	4,632
Accrued employee compensation	5,803	6,045
Accrued lease operating expenses	3,310	2,130
Other	2,182	1,898
Total accrued expenses	$ 72,470	$ 68,086