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Earnings Per Share - Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic earnings (loss) per share-      
Net income (loss) $ 369,658 $ 325,928 $ (240,634)
Weighted-average shares outstanding 42,111 42,036 43,716
Non-vested dividend participating awards 308 322 145
Weighted-average shares outstanding used for basic earnings per share 42,419 42,358 43,861
Basic earnings (loss) per share from continuing operations $ 8.71 $ 7.69 $ (5.49)
Diluted earnings (loss) per share-      
Net income (loss) $ 369,658 $ 325,928 $ (240,634)
Weighted-average shares outstanding used for basic earnings per share 42,419 42,358 43,861
Share options on issue   5 8
Adjusted weighted average number of ordinary shares outstanding, Total 42,419 42,363 43,869
Diluted earnings (loss) per share from continuing operations $ 8.71 $ 7.69 $ (5.49)