Stock Option Plans - Black-Scholes Option Pricing Model with Weighted Average (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Expected dividend yield	1.20%	1.30%	1.50%
Expected risk-free interest rate	3.60%	1.90%	0.90%
Volatility	25.00%	23.10%	22.90%
Expected life (in years)	5 years 6 months	5 years 4 months 24 days	5 years 4 months 24 days