Stock-Based Compensation Plans - Restricted Stock, Restricted Stock Unit, Performance Share and Performance Stock Unit Activity (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Shares, Beginning balance	162,356	162,610	230,647
Number of Restricted Shares, Granted	90,242	72,861	47,142
Number of Restricted Shares, Performance share pay-out	12,145	0	0
Number of Restricted Shares, Canceled	(5,272)	(8,513)	(3,911)
Number of Restricted Shares, Vested	(98,927)	(64,602)	(111,268)
Number of Restricted Shares, Ending balance	160,544	162,356	162,610
Weighted Average Grant Date Fair Value, Beginning balance	$ 321.04	$ 316.56	$ 224.63
Weighted Average Grant Date Fair Value, Ending balance	$ 346.15	$ 321.04	$ 316.56