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Earnings Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 20, 2021 | Dec. 31, 2020 | Jul. 31, 2019 | Jul. 19, 2019
Stock options, outstanding | 658,600 | 723,914 | 658,600 | 723,914 |  | 696,711 |  |
Stock options, weighted average exercise price | $ 54.93 | $ 41.03 | $ 54.93 | $ 41.03 |  | $ 43.88 |  |
Common stock excluded from calculation of diluted earnings per share | 44,912 | 60,202 | 63,770 | 117,160 |  |  |  |
Dilutive effect on shares of conversion premium | 1,373,341 | 0 | 1,180,425 | 0 |  |  |  |
Contingent consideration obligation for earnout payments |  |  |  |  | $ 80.0 |  |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 287.5 | $ 287.5
Restricted Stock Units and Performance Stock Units |  |  |  |  |  |  |  |
Restricted stock units, outstanding | 619,761 | 675,567 | 619,761 | 675,567 |  | 665,540 |  |

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