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Quarterly Financial Data - Unaudited - Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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)

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