Stock Based Compensation - Schedule of Analysis of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, beginning of year, Shares | shares	1,833,057
Shares, Granted | shares	212,588
Exercised, Shares | shares	(273,646)
Cancelled, Shares | shares	(27,240)
Outstanding, end of year, Shares | shares	1,744,759
Exercisable at end of year, Shares | shares	830,161
Outstanding, beginning of year, Weighted-Average Ex. Price | $ / shares	$ 20.85
Granted, Weighted-Average Ex. Price | $ / shares	48.91
Exercised, Weighted-Average Ex. Price | $ / shares	17.12
Cancelled, Weighted-Average Ex. Price | $ / shares	25.73
Outstanding, end of year, Weighted-Average Ex. Price | $ / shares	24.78
Exercisable at end of year, Weighted-Average Ex. Price | $ / shares	$ 19.04