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Share-based Compensation - Additional Information (Detail) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Shares issued under stock purchase plan, stock option exercises and restricted stock awards and units | 58,357 | 43,603 | 244,801 | 295,496

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- Definition Stock shares issued net of shares for tax withholdings. + References No definition available. + Details
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- References No definition available. + Details
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