Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning period - Options | shares	1,257,730
Options granted | shares	170,000
Options exercised | shares	(42,900)
Options canceled, forfeited, or expired | shares	(139,000)
Outstanding at ending period - Options | shares	1,245,830
Exercisable at ending period - Options | shares	699,080
Outstanding at beginning period - Wgtd. Avg. Exercise Price | $ / shares	$ 32.70
Options granted - Wgtd. Avg. Exercise Price | $ / shares	48.92
Options exercised - Wgtd. Avg. Exercise Price | $ / shares	19.27
Options canceled, forfeited, or expired - Wgtd. Avg. Exercise Price | $ / shares	51.75
Outstanding at ending period - Wgtd. Avg. Exercise Price | $ / shares	33.25
Exercisable at ending period - Wgtd. Avg. Exercise Price | $ / shares	$ 24.72
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	8 years 8 months 26 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	7 years 18 days
Outstanding at ending period - Aggregate Intrinsic Value | $	$ 9,459
Exercisable at ending period - Aggregate Intrinsic Value | $	$ 11,267