Summary of Significant Accounting Policies - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accrued drilling, completion and facility costs	$ 6,700	$ 25,667
Accrued lease operating, gathering, transportation and processing expenses	6,113	8,046
Accrued general and administrative expenses	7,985	6,612
Accrued interest payable	18,739	6,832
Trade payables	3,366	17,488
Operating lease liability	1,955	1,287
Other	2,387	5,706
Total accounts payable and accrued liabilities	$ 47,245	$ 71,638