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Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 495,401 $ (47,156) $ 485,397
Less: Dividends paid on and earnings/(loss) allocated to participating securities (3,795) (3,357) (3,425)
Earnings/(loss) applicable to common stock $ 491,606 $ (50,513) $ 481,972
Weighted average common shares outstanding 485,150,173 448,982,223 440,988,102
Basic earnings (loss) per common share $ 1.01 $ (0.11) $ 1.09
Potential dilutive common shares [1] 0 0 0
Total shares for diluted earnings (loss) per share computation 485,150,173 448,982,223 440,988,102
Diluted earnings (loss) per common share and common share equivalents $ 1.01 $ (0.11) $ 1.09
[1] Options to purchase 58,560 shares of the Company's common stock that were outstanding as of December 31, 2014 at a weighted average exercise price of $18.04 were excluded from the computation of diluted EPS because their inclusion would have had an antidilutive effect. At December 31, 2016 and 2015, there were no stock options outstanding.