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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ 2,615,825 | $ (212,867) | $ (7,231,629)
Revisions in quantities | 445,667 | 96,615 | (868,886)
Changes in future development and abandonment costs | (497,400) | (314,864) | 359,540
Net change in income taxes | (706,531) | 27,842 | 2,173,904
Accretion of discount | 372,743 | 302,920 | 1,007,027
Purchases of reserves in place | 6,173 | 488,959 | 0
Additions to proved reserves from extensions, discoveries and improved recovery | 2,128,135 | 541,095 | 486,478
Natural gas, NGLs and oil sales, net of production costs | (1,237,970) | (509,174) | (522,682)
Development costs incurred during the period | 885,803 | 435,928 | 1,033,539
Sales of reserves in place | (32,946) | (65,538) | (1,050,237)
Timing and other | (266,214) | (64,850) | (254,218)
Net change for the year | 3,713,285 | 726,066 | (4,867,164)
Beginning of year | 3,451,929 | 2,725,863 | 7,593,027
End of year | $ 7,165,214 | $ 3,451,929 | $ 2,725,863

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