Significant Accounting Policies - Summary of Assumptions for Options Granted (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Volatility factor	21.80%	15.70%	15.70%
Dividend yield	0.80%	0.70%	0.80%
Expected term (in years)	5 years 1 month 9 days	5 years 1 month 13 days	5 years 1 month 6 days
Risk-free rate	0.60%	1.20%	2.50%