Stock-Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans Recognized (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 1,811	$ 1,183
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options	203	243
Stock Options [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	62	190
Restricted Stock Awards and Restricted Stock Units [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	1,701	949
Employee Stock Purchase Plan [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 48	$ 44