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Quarterly Financial Data - Unaudited - Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 404,469 $ 304,748 $ 254,091 $ 285,116 $ 217,991 $ 177,311 $ 179,080 $ 130,283 $ 1,248,424 $ 704,665 $ 789,735
Operating income 86,103 32,394 5,379 20,092 (1,702) (25,702) (28,214) (75,215) 143,968 (130,833) (114,164)
Net income (loss) including non-controlling interests 128,117 (41,064) 16,568 23,825 (54,688) (33,942) (89,931) (64,455) 127,446 (243,016) (40,248)
Net income (loss) $ 124,617 $ (41,214) $ 16,568 $ 23,825 $ (54,688) $ (33,942) $ (89,931) $ (64,455) $ 123,796 $ (243,016) $ (40,248)
Basic earnings (loss) per share (in dollars per share) $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.25) $ (0.19) $ (0.51) $ (0.40) $ 0.53 $ (1.32) $ (0.31)
Diluted earnings (loss) per share (in dollars per share) $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.25) $ (0.19) $ (0.51) $ (0.40) $ 0.52 $ (1.32) $ (0.31)