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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