Shareholders' Equity - Assumptions to Estimate Fair Value of Employee Stock Purchase Rights on Date of Grant Using Black Scholes Option Pricing Model (Detail) - Employee Stock Purchase Plan - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.10%	1.40%	1.40%
Volatility	20.00%	32.00%	23.00%
Risk-free interest rates	0.08%	0.15%	1.96%
Expected life (years)	1 year	1 year	1 year
Weighted average fair value	$ 28.55	$ 23.26	$ 17.03