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Summary of Significant Accounting Policies - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2019
Accounting Policies [Abstract] |  |
Revenues: | $ 247,192 | $ 858,042
Net Income | $ 36,755 | $ 201,338
Net income per share: |  |
Basic (in dollars per share) | $ 0.15 | $ 0.93
Diluted (in dollars per share) | $ 0.13 | $ 0.72

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