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Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic      
Net Income (Loss) $ 126,628 $ (213,512) $ (533,299)
Less: Net income (loss) allocable to participating RSUs 0 0 0
Net income (loss) available for basic common shares $ 126,628 $ (213,512) $ (533,299)
Weighted-average common shares outstanding (in shares) 347,463 346,127 345,012
Basic net income (loss) per common share (USD per share) $ 0.36 $ (0.62) $ (1.55)
Diluted      
Net Income (Loss) $ 126,628 $ (213,512) $ (533,299)
Less: Net income (loss) allocable to participating RSUs 0 0 0
Net income (loss) available for diluted common shares $ 126,628 $ (213,512) $ (533,299)
Weighted-average common shares outstanding (in shares) 347,463 346,127 345,012
Dilutive stock options and non-participating RSUs (in shares) 1,653 0 0
Weighted-average number of common and potential common shares (in shares) 349,116 346,127 345,012
Diluted net loss per common share (USD per share) $ 0.36 $ (0.62) $ (1.55)
Antidilutive securities excluded from computation of earnings per share (in shares) 21,700