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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ 2,959,488 | $ 2,615,825 | $ (212,867)
Revisions in quantities | 667,763 | 445,667 | 96,615
Changes in future development and abandonment costs | (557,518) | (497,400) | (314,864)
Net change in income taxes | (1,075,867) | (706,531) | 27,842
Accretion of discount | 814,725 | 372,743 | 302,920
Purchases of reserves in place |  | 6,173 | 488,959
Additions to proved reserves from extensions, discoveries and improved recovery | 2,543,296 | 2,128,135 | 541,095
Natural gas, NGLs and oil sales, net of production costs | (1,547,580) | (1,237,970) | (509,174)
Development costs incurred during the period | 722,074 | 885,803 | 435,928
Sales of reserves in place | (226,953) | (32,946) | (65,538)
Timing and other | (349,048) | (266,214) | (64,850)
Net change for the year | 3,950,380 | 3,713,285 | 726,066
Beginning of year | 7,165,214 | 3,451,929 | 2,725,863
End of year | $ 11,115,594 | $ 7,165,214 | $ 3,451,929

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