Postretirement Benefit Plans - Fair Value Changes Within Asset Categories for which Fair Value Measurements Use Significant Unobservable Inputs Level 3 (Detail) - Insurance Contracts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 677	$ 1,003
Sale proceeds (benefit payments)	(123)	(104)
Change in unrealized gain	169	(120)
Foreign exchange impact	37	(102)
Ending balance	$ 760	$ 677