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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic earnings (loss) per share:    
Net income (loss) available to common stockholders $ 58,774 $ 36,825
Basic weighted-average shares of common stock outstanding 307,728 283,399
Basic earnings (loss) per share $ 0.19 $ 0.13