Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Outstanding at beginning period - Options	1,343,080	1,257,730
Options granted	179,500	171,000
Options exercised	(214,330)	(76,650)
Options canceled, forfeited, or expired	(5,000)	(9,000)
Outstanding at ending period - Options	1,303,250	1,343,080
Exercisable at ending period - Options	614,875	710,330
Outstanding at beginning period - Wgtd. Avg. Exercise Price	$ 35.28	$ 32.70
Options granted - Wgtd. Avg. Exercise Price	62.13	48.89
Options exercised - Wgtd. Avg. Exercise Price	23.40	20.53
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price	44.23	58.26
Outstanding at ending period - Wgtd. Avg. Exercise Price	40.90	35.28
Exercisable at ending period - Wgtd. Avg. Exercise Price	$ 28.03	$ 25.06
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	8 years 4 months 24 days	8 years 7 months 9 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	7 years 1 month 24 days	6 years 11 months 8 days
Outstanding at ending period - Aggregate Intrinsic Value	$ 38,656	$ 31,453
Exercisable at ending period - Aggregate Intrinsic Value	$ 26,153	$ 23,894