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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ (212,867) | $ (7,231,629) | $ 5,069
Revisions in quantities | 96,615 | (868,886) | 102,760
Changes in future development and abandonment costs | (314,864) | 359,540 | (407,688)
Net change in income taxes | 27,842 | 2,173,904 | (441,935)
Accretion of discount | 302,920 | 1,007,027 | 789,754
Purchases of reserves in place | 488,959 | 0 | 297,358
Additions to proved reserves from extensions, discoveries and improved recovery | 541,095 | 486,478 | 2,713,999
Natural gas, NGLs and oil sales, net of production costs | (509,174) | (522,682) | (1,391,663)
Development costs incurred during the period | 435,928 | 1,033,539 | 755,384
Sales of reserves in place | (65,538) | (1,050,237) | (249,055)
Timing and other | (64,850) | (254,218) | (443,187)
Net change for the year | 726,066 | (4,867,164) | 1,730,796
Beginning of year | 2,725,863 | 7,593,027 | 5,862,231
End of year | $ 3,451,929 | $ 2,725,863 | $ 7,593,027

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