Stock-Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 455	$ 594
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options	106	165
Stock Options [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	108	216
Restricted Stock Awards and Restricted Stock Units [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	327	361
Employee Stock Purchase Plan [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Total expense	$ 20	$ 17