Stock-Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans Recognized (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 2,746	$ 1,918
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options	389	375
Stock Options [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	62	274
Restricted Stock Awards and Restricted Stock Units [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	2,612	1,579
Employee Stock Purchase Plan [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 72	$ 65