Stock-Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock-based compensation expense:
Total expense	$ 4,298	$ 4,220	$ 3,789
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options	702	666	551
Stock Options [Member]
Stock-based compensation expense:
Total expense	0	0	62
Restricted Stock Awards and Restricted Stock Units [Member]
Stock-based compensation expense:
Total expense	4,194	4,120	3,636
Employee Stock Purchase Plan [Member]
Stock-based compensation expense:
Total expense	$ 104	$ 100	$ 91