Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 565	$ 532	$ 558
Interest cost	2,383	2,365	1,573
Expected loss on plan assets	(3,478)	(3,056)	(3,756)
Amortization of net actuarial loss (gain)	700	1,001	817
Net periodic benefit cost (income)	170	842	(808)
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	56	76	123
Interest cost	108	129	96
Expected loss on plan assets	0	0	0
Amortization of net actuarial loss (gain)	(113)	(16)	56
Net periodic benefit cost (income)	$ 51	$ 189	$ 275