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Earnings Per Share - Calculation of Basic Earnings Per Share from Continuing and Discontinued Operations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic earnings (loss) per share:    
Net income (loss) from continuing operations available to common stockholders $ 61,868 $ 43,998
Net income (loss) from discontinued operations available to common stockholders   14,776
Net income (loss) available to common stockholders $ 61,868 $ 58,774
Basic weighted-average shares of common stock outstanding 338,403 307,728
Continuing operations $ 0.18 $ 0.14
Discontinued operations   0.05
Basic earnings (loss) per share $ 0.18 $ 0.19