Stock Options and Restricted Stock - Summary of Activity for Stock Option Programs (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Aggregate intrinsic value for option exercised			$ 0.1
Aggregate intrinsic value of option outstanding	$ 0.5	$ 0.5
Aggregate intrinsic value of option vested	0.4	$ 0.4
Remaining contractual life of option outstanding		6 years 4 months 24 days
Remaining contractual life of option vested		6 years 1 month 6 days
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Aggregate intrinsic value for option exercised	$ 0.1	$ 0.1