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	Sep. 30, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Accrued lease operating expense	$ 11,561	$ 10,469
Accrued capital expenditures	5,448	4,349
Accrued general and administrative expense	4,459	4,393
Accrued ad valorem tax	2,541	729
Operating lease liability	1,732	0
Asset retirement obligations	477	477
Accrued interest payable	38	2,476
Other	71	262
Accrued liabilities	$ 26,327	$ 23,155