Summary of Changes in Unvested Units of Restricted Stock (Detail) - Restricted Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Outstanding at January 1, 2022	1,388,467
Number of units, Granted	683,271
Number of units, Vested	(606,607)
Number of units, Forfeited	(37,300)
Number of units, Outstanding at December 31, 2022	1,427,831	1,388,467
Grant date fair value, Outstanding at January 1, 2022	$ 85.05
Grant date fair value, Granted	123.75	$ 128.62	$ 77.20
Grant date fair value, Vested	76.33
Grant date fair value, Forfeited	114.56
Grant date fair value, Outstanding at December 31, 2022	$ 106.50	$ 85.05