Supplemental Oil and Gas Information (Unaudited) - Additional Information (Detail) - MMBoe	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Supplemental Oil and Gas Information (Unaudited)
Percent of discount factor to proved reserves	10.00%
Increase (reduction) in reserves	7.4	(49.2)
Upward price revisions in proved reserve	30.6
Downward price revisions in proved reserve		50.1
Reduction due to removed PUD locations	16
Extensions, discoveries and additions related to wells in progress	1.7
Upward revision due to lower maintenance cost		4.5
Extensions and discoveries		0.46
Proved developed and undeveloped reserves, reduction due to increase in maintenance cost	1.2
Proved developed and undeveloped reserves, upward technical revision	0.9	3.7
Proved developed and undeveloped reserve, upward revision due to special royalty relief		2.4