Net Income Per Common Share - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Outstanding stock options and unvested restricted stock units excluded from computation of diluted EPS	84,000	45,000	81,000	35,000
Diluted weighted average shares	34,265,432	32,144,239	34,343,902	32,121,463
Interest and Debt Expense	$ 0.6	$ 0.4	$ 1.3	$ 0.8
Interest Expense [Member]
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Diluted weighted average shares	3,900,000	2,900,000	3,900,000	2,900,000