Supplemental Oil and Gas Information (Unaudited) -Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Oil and Gas Information (Unaudited)
Future cash inflows	$ 4,569,313	$ 2,410,260
Future production costs	(2,691,875)	(1,589,945)
Future development costs	(231,040)	(375,146)
Future income tax expense	0	0
Future net cash flows for estimated timing of cash flows	1,646,398	445,169
10% annual discount for estimated timing of cash flows	(726,553)	(147,358)
Standardized measure of discounted future net cash flows	$ 919,845	$ 297,811	$ 916,561