Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Proved Undeveloped Reserves (Detail)	12 Months Ended
	Dec. 31, 2021 MMcfe
Extractive Industries [Abstract]
Beginning proved undeveloped reserves at December 31, 2020	7,410,574
Undeveloped reserves transferred to developed	(1,199,544)
Revisions	(393,561)	[1]
Extension and discoveries	1,540,128
Ending proved undeveloped reserves at December 31, 2020	7,357,597

[1] Includes 1.3 Tcfe of proved undeveloped reserves removed and deferred due to the five-year rule which can be included in our future proved reserves as these locations are added back to our five-year development plan.