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Earnings Per Share - Schedule of EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic:        
Net (Loss) Income $ (603,247) $ 236,250 $ (772,553) $ 144,177
Less: net income allocable to participating RSUs 0 (610) 0 (1,628)
Net (loss) income available for basic common shares $ (603,247) $ 235,640 $ (772,553) $ 142,549
Weighted average common shares outstanding 343,870 341,961 343,304 341,089
Basic net (loss) income per common share (in USD per share) $ (1.75) $ 0.69 $ (2.25) $ 0.42
Diluted:        
Net (Loss) Income $ (603,247) $ 236,250 $ (772,553) $ 144,177
Less: net income allocable to participating RSUs 0 (609) 0 (1,628)
Net (loss) income available for diluted common shares $ (603,247) $ 235,641 $ (772,553) $ 142,549
Weighted average common shares outstanding 343,870 341,961 343,304 341,089
Weighted average common equivalent shares arising from:        
Dilutive stock options and non-participating RSUs (in shares) 0 2,265 0 2,209
Weighted average number of common and potential common shares 343,870 344,226 343,304 343,298
Diluted net (loss) income per common share (in USD per share) $ (1.75) $ 0.68 $ (2.25) $ 0.42
Antidilutive securities excluded from computation of earnings per share   9,800   7,700