Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Extractive Industries [Abstract]
Future cash inflows		$ 69,403,611	$ 35,820,758
Future costs:
Production		(27,015,321)	(23,281,268)
Development	[1]	(2,469,028)	(2,744,539)
Future net cash flows before income taxes		39,919,262	9,794,951
Future income tax expense		8,146,832	(1,240,011)
Total future net cash flows before 10% discount		31,772,430	8,554,940
10% annual discount		(19,287,204)	(5,708,618)
Standardized measure of discounted future net cash flows		$ 12,485,226	$ 2,846,322	$ 6,628,573	$ 11,115,594

[1] ncludes $308.5 million of undiscounted future asset retirement costs as of December 31, 2021, using current estimates of future abandonment costs.