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Supplemental Oil and Gas Reserve Information - Unaudited - Net Proved, Proved Developed and Proved Undeveloped Reserves (Detail)
 12 Months Ended
Dec. 31, 2021
MBbls
Dec. 31, 2021
MBbls
MMcf
Dec. 31, 2021
MBoe
MBbls
Dec. 31, 2021
Boe
MBbls
Dec. 31, 2020
MBbls
Dec. 31, 2020
MBbls
MMcf
Dec. 31, 2020
MBoe
MBbls
Dec. 31, 2020
Boe
MBbls
Dec. 31, 2019
MBbls
Dec. 31, 2019
MMcf
MBbls
Dec. 31, 2019
MBoe
MBbls
Dec. 31, 2019
Boe
MBbls
Dec. 31, 2019
MMBoe
MBbls
Dec. 31, 2021
MMcf
Dec. 31, 2021
MBoe
Dec. 31, 2020
MMcf
Dec. 31, 2020
MBoe
Dec. 31, 2019
MMcf
Dec. 31, 2019
MBoe
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]                                      
Proved reserves (Volume), beginning balance 119,765,000 376,170,000     200,787,000 513,533,000     228,416,000 552,726,000                  
Proved reserves (Energy), beginning balance     182,460,000       286,376,000       320,537,000                
Revisions of previous estimates (Volume) 42,411,000 68,768,000     (69,782,000) (98,815,000)     (51,965,000) (68,301,000)                  
Revisions of previous estimates (Energy)     53,871,000 53,900,000     (86,251,000) (86,300,000)     (63,349,000) (63,300,000)              
Extensions, discoveries and other additions (Volume) 7,734,000 14,539,000     4,578,000 8,659,000     49,297,000 87,382,000                  
Extensions, discoveries and other additions (Energy)     10,157,000 10,200,000     6,021,000 6,000,000.0     63,861,000 63,900,000              
Sales of reserves in place (Volume) (24,760,000) (40,211,000)             (2,136,000) (2,368,000)                  
Sales of reserves in place (Energy)     (31,461,000)         0     (2,531,000)                
Purchases of reserves in place (Volume) 42,656,000 86,153,000                                  
Purchases of reserves in place (MMBoe)     57,015,000                   0            
Production (Volume) (13,489,000) (46,157,000)     (15,818,000) (47,207,000)     (22,825,000) (55,906,000)                  
Production (Energy)     (21,182,000)       (23,686,000)       (32,142,000)                
Net proved reserves (Volume), closing balance 174,317,000 459,262,000     119,765,000 376,170,000     200,787,000 513,533,000                  
Net proved reserves (Energy), closing balance     250,860,000       182,460,000       286,376,000                
Proved developed reserves (Volume) 114,041,000 114,041,000 114,041,000 114,041,000 85,428,000 85,428,000 85,428,000 85,428,000 113,418,000 113,418,000 113,418,000 113,418,000 113,418,000 361,836,000   262,676,000   314,000,000  
Proved developed reserves (Energy)                             174,347,000   129,207,000   165,751,000
Proved undeveloped reserve (Volume) 60,276,000 60,276,000 60,276,000 60,276,000 34,337,000 34,337,000 34,337,000 34,337,000 87,369,000 87,369,000 87,369,000 87,369,000 87,369,000 97,426,000   113,494,000   199,533,000  
Proved undeveloped reserves (Energy)                             76,513,000   53,253,000   120,625,000