Retirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss	$ (506)	$ (525)	$ (590)
Transition obligation	125	184	244
Total	(381)	$ (341)	$ (346)
Postretirement Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss	(101)
Transition obligation	76
Total	$ (25)