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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ (4,868,371) | $ (6,560,107) | $ 2,959,488
Revisions in quantities | (345,073) | (12,741) | 667,763
Changes in future development and abandonment costs | 107,899 | 104,585 | (686,632)
Net change in income taxes | 797,816 | 1,125,639 | (1,075,867)
Accretion of discount | 756,083 | 1,317,349 | 814,725
Additions to proved reserves from extensions, discoveries and improved recovery | 280,441 | 552,710 | 2,543,296
Natural gas, NGLs and oil sales, net of production costs | (402,450) | (881,883) | (1,547,580)
Actual development costs incurred during the period | 384,530 | 676,520 | 851,188
Sales of reserves in place | (394,125) | (688,937) | (226,953)
Timing and other | (99,001) | (120,156) | (349,048)
Net change for the year | (3,782,251) | (4,487,021) | 3,950,380
Beginning of year | 6,628,573 | 11,115,594 | 7,165,214
End of year | $ 2,846,322 | $ 6,628,573 | $ 11,115,594

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