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Stock Plans - Weighted Average Assumptions and Fair Value of Stock Option Grants (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
Share-based Payment Arrangement [Abstract]  
Fair value per option (dollars per share) $ 59.07
Risk-free interest rate 2.30%
Expected dividend yield 1.70%
Expected volatility 31.00%
Expected life (years) 6 years 4 months 24 days