Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Current Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Accrued lease operating expense	$ 9,831	$ 10,469
Accrued capital expenditures	8,816	4,349
Accrued general and administrative expense	4,972	4,393
Accrued interest payable	3,435	2,476
Operating lease liability	2,126	0
Accrued ad valorem tax	1,682	729
Asset retirement obligations	477	477
Other	21	262
Accrued liabilities	$ 31,360	$ 23,155