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Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic:                      
Net income (loss) $ 173,845 $ 236,250 $ (19,114) $ (72,959) $ 215,160 $ 223,784 $ (11,351) $ (58,177) $ 318,022 $ 369,416 $ 498,874
Less: Net income allocable to participating RSUs                 (1,377) (3,179) (4,028)
Net income available for basic common shares                 $ 316,645 $ 366,237 $ 494,846
Weighted average number of common shares (in shares) 342,653 341,961 340,926 340,369 339,815 339,420 338,843 338,579 341,480 339,172 339,016
Net Income Per Common Share-Basic (in USD per share) $ 0.51 $ 0.69 $ (0.06) $ (0.21) $ 0.63 $ 0.66 $ (0.03) $ (0.17) $ 0.93 $ 1.08 $ 1.46
Diluted:                      
Net income (loss) $ 173,845 $ 236,250 $ (19,114) $ (72,959) $ 215,160 $ 223,784 $ (11,351) $ (58,177) $ 318,022 $ 369,416 $ 498,874
Less: Net income allocable to participating RSUs                 (1,377) (3,179) (4,028)
Net income available for diluted common shares                 $ 316,645 $ 366,237 $ 494,846
Weighted average number of common shares (in shares) 342,653 341,961 340,926 340,369 339,815 339,420 338,843 338,579 341,480 339,172 339,016
Weighted average common equivalent shares arising from:                      
Dilutive stock options and non-participating RSUs (in shares)                 2,753 576 1,752
Weighted average number of common and potential common shares (in shares) 344,996 344,226 340,926 340,369 340,364 339,790 338,843 338,579 344,233 339,748 340,768
Net Income Per Common Share-Diluted (in USD per share) $ 0.50 $ 0.68 $ (0.06) $ (0.21) $ 0.63 $ 0.66 $ (0.03) $ (0.17) $ 0.92 $ 1.08 $ 1.45