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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
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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

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