Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revisions of previous estimates
Changes in prices and production costs	$ 11,600,850	$ (4,868,371)	$ (6,560,107)
Revisions in quantities	577,737	(345,073)	(12,741)
Changes in future development and abandonment costs	(53,818)	107,899	104,585
Net change in income taxes	(2,248,161)	797,816	1,125,639
Accretion of discount	298,077	756,083	1,317,349
Additions to proved reserves from extensions, discoveries and improved recovery	1,423,510	280,441	552,710
Natural gas, NGLs and oil sales, net of production costs	(1,934,254)	(402,450)	(881,883)
Actual development costs incurred during the period	399,681	384,530	676,520
Sales of reserves in place	0	(394,125)	(688,937)
Timing and other	(424,718)	(99,001)	(120,156)
Net change for the year	9,638,904	(3,782,251)	(4,487,021)
Beginning of year	2,846,322	6,628,573	11,115,594
End of year	$ 12,485,226	$ 2,846,322	$ 6,628,573