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Earnings Per Share - Summary (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Basic:                      
Net (Loss) Income $ (281,283) $ (603,247) $ (56,075) $ (113,231) $ 173,845 $ 236,250 $ (19,114) $ (72,959) $ (1,053,836) $ 318,022 $ 369,416
Less: Net income allocable to participating RSUs (a)                 0 (1,377) (3,179)
Net (loss) income available for basic common shares                 $ (1,053,836) $ 316,645 $ 366,237
Weighted average number of common shares (in shares) 344,294 343,870 343,116 342,914 342,653 341,961 340,926 340,369 343,564 341,480 339,172
Basic net income per common share (USD per share) $ (0.82) $ (1.75) $ (0.16) $ (0.33) $ 0.51 $ 0.69 $ (0.06) $ (0.21) $ (3.07) $ 0.93 $ 1.08
Diluted:                      
Net (Loss) Income $ (281,283) $ (603,247) $ (56,075) $ (113,231) $ 173,845 $ 236,250 $ (19,114) $ (72,959) $ (1,053,836) $ 318,022 $ 369,416
Less: Net income allocable to participating RSUs (a)                 0 (1,377) (3,179)
Net (loss) income available for diluted common shares                 $ (1,053,836) $ 316,645 $ 366,237
Weighted average number of common shares (in shares) 344,294 343,870 343,116 342,914 342,653 341,961 340,926 340,369 343,564 341,480 339,172
Weighted average common equivalent shares arising from:                      
Dilutive stock options and non-participating RSUs (in shares)                 0 2,753 576
Weighted average number of common and potential common shares (in shares) 344,294 343,870 343,116 342,914 344,996 344,226 340,926 340,369 343,564 344,233 339,748
Diluted net income per common share (USD per share) $ (0.82) $ (1.75) $ (0.16) $ (0.33) $ 0.50 $ 0.68 $ (0.06) $ (0.21) $ (3.07) $ 0.92 $ 1.08