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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, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revisions of previous estimates |  |  |
Changes in prices | $ 2,172,704 | $ (2,498,616) | $ 422,080
Revisions in quantities | 513,168 | 88,190 | 326,240
Changes in future development costs | (275,468) | (354,766) | (346,378)
Accretion of discount | 395,989 | 608,381 | 464,735
Net change in income taxes | (1,299,227) | 832,830 | (400,690)
Purchases of reserves in place |  |  |
Additions to proved reserves from extensions, discoveries and improved recovery | 1,981,054 | 1,429,340 | 2,169,706
Production | (1,286,103) | (976,224) | (911,873)
Development costs incurred during the period | 462,862 | 562,329 | 513,551
Sales of natural gas and oil | (162,463) | (120,637) | (1,313,401)
Timing and other | 135,910 | (861,919) | 111,801
Net change for the year | 2,638,426 | (1,291,092) | 1,035,771
Beginning of year | 3,223,805 | 4,514,897 | 3,479,126
End of year | $ 5,862,231 | $ 3,223,805 | $ 4,514,897

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