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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
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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

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