Stock-Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock-based compensation expense:
Total expense	$ 4,706	$ 4,298	$ 4,220
Tax benefit on nonqualified stock option expense and disqualifying dispositions of incentive stock options	1,041	702	666
Restricted Stock Units (RSUs) [Member]
Stock-based compensation expense:
Total expense	4,615	4,194	4,120
Employee Stock Purchase Plan [Member]
Stock-based compensation expense:
Total expense	$ 91	$ 104	$ 100