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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ (6,560,107) | $ 2,959,488 | $ 2,615,825
Revisions in quantities | (12,741) | 667,763 | 445,667
Changes in future development and abandonment costs | 104,585 | (686,632) | (814,215)
Net change in income taxes | 1,125,639 | (1,075,867) | (706,531)
Accretion of discount | 1,317,349 | 814,725 | 372,743
Purchases of reserves in place | 0 | 0 | 6,173
Additions to proved reserves from extensions, discoveries and improved recovery | 552,710 | 2,543,296 | 2,128,135
Natural gas, NGLs and oil sales, net of production costs | (881,883) | (1,547,580) | (1,237,970)
Actual development costs incurred during the period | 676,520 | 851,188 | 1,202,618
Sales of reserves in place | (688,937) | (226,953) | (32,946)
Timing and other | (120,156) | (349,048) | (266,214)
Net change for the year | (4,487,021) | 3,950,380 | 3,713,285
Beginning of year | 11,115,594 | 7,165,214 | 3,451,929
End of year | $ 6,628,573 | $ 11,115,594 | $ 7,165,214

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