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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revisions of previous estimates |  |  |
Changes in prices and production costs | $ (7,231,629) | $ 5,069 | $ 2,172,704
Revisions in quantities | (868,886) | 102,760 | 513,168
Changes in future development and abandonment costs | 359,540 | (407,688) | (275,468)
Net change in income taxes | 2,173,904 | (441,935) | (1,299,227)
Accretion of discount | 1,007,027 | 789,754 | 395,989
Purchases of reserves in place | 0 | 297,358 | 0
Additions to proved reserves from extensions, discoveries and improved recovery | 486,478 | 2,713,999 | 1,981,054
Natural gas, NGLs and oil sales, net of production costs | (522,682) | (1,391,663) | (1,286,103)
Development costs incurred during the period | 1,033,539 | 755,384 | 462,862
Sales of reserves in place | (1,050,237) | (249,055) | (162,463)
Timing and other | (254,218) | (443,187) | 135,910
Net change for the year | (4,867,164) | 1,730,796 | 2,638,426
Beginning of year | 7,593,027 | 5,862,231 | 3,223,805
End of year | $ 2,725,863 | $ 7,593,027 | $ 5,862,231

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