Stock Plans - Summary of Performance Stock Unit Activity (Detail) - Performance stock - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares
Beginning balance (in shares)	193,335	200,212	238,035
Granted (in shares)	81,504	52,309	67,479
Vested (in shares)	(55,447)	(64,543)	(132,036)
Performance adjustments (in shares)	(22,147)	5,357	33,499
Forfeited (in shares)	(18,485)		(6,765)
Ending balance (in shares)	178,760	193,335	200,212
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 129.86	$ 104.69	$ 85.39
Granted (in dollars per share)	142.38	175.59	127.48
Vested (in dollars per share)	101.38	85.41	73.00
Performance adjustments (in dollars per share)	99.84	88.45	72.36
Forfeited (in dollars per share)	147.66		111.60
Ending balance (in dollars per share)	$ 146.28	$ 129.86	$ 104.69