Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 532	$ 558	$ 567
Interest cost	2,365	1,573	1,431
Expected loss on plan assets	(3,056)	(3,756)	(3,656)
Amortization of net actuarial loss (gain)	1,001	817	1,269
Net periodic benefit cost (income)	842	(808)	(389)
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	76	123	143
Interest cost	129	96	85
Expected loss on plan assets	0	0	0
Amortization of net actuarial loss (gain)	(16)	56	47
Net periodic benefit cost (income)	$ 189	$ 275	$ 275