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Earnings Per Share - Additional Information (Detail) - 4.50 % Convertible Senior Notes - $ / shares | Sep. 30, 2020 | Aug. 21, 2020
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Earnings Per Share Disclosure [Line Items] |  |
Interest rate | 4.50% | 4.50%
Warrants, per share | $ 22.08 |
Common shares issued | 32,051,282 |

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