Postretirement Benefit Plans - Fair Value Changes Within Asset Categories for which Fair Value Measurements Use Significant Unobservable Inputs Level 3 (Detail) - Insurance Contracts [Member] - United Kingdom [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 760	$ 677
Sale proceeds (benefit payments)	(129)	(123)
Change in unrealized gain	13	169
Foreign exchange impact	(11)	37
Ending balance	$ 633	$ 760