Stock Options and Restricted Stock - Summary of Activity for Restricted Stock Programs (Parenthetical) (Detail) - Restricted Shares [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of restricted stock vested	$ 2.1	$ 1.0
Aggregate fair value of restricted stock outstanding	$ 6.4
Remaining vesting period of restricted stock	2 years 4 months 24 days