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Quarterly Financial Data - Unaudited - Results of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 182,067 | $ 197,235 | $ 230,046 | $ 180,387 | $ 299,672 | $ 368,659 | $ 372,378 | $ 349,519 | $ 789,735 | $ 1,390,228 | $ 1,141,999
Operating income (loss) | (53,166) | (19,926) | (7,437) | (33,635) | 15,924 | 134,103 | 166,545 | 329,080 | (114,164) | 645,652 | 504,398
Net income (loss) | $ 3,968 | $ 27,055 | $ (53,230) | $ (18,041) | $ 176,504 | $ 121,587 | $ 38,833 | $ 169,953 | $ (40,248) | $ 506,877 | $ 227,959

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