Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)
Foreign Defined Benefits Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	$ 42,338	£ 33,257
Fair value of plan assets, Ending balance	36,101	£ 28,800	$ 42,338
Defined Benefit Pension Plan [Member] | U.S. [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	163,929		161,374
Actual return on plan assets	7,910		16,845
Corporate contributions	6,206		1,108
Gross benefits paid	(19,341)		(15,398)
Fair value of plan assets, Ending balance	158,704		163,929
Defined Benefit Pension Plan [Member] | Foreign Defined Benefits Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	42,338		41,679
Actual return on plan assets	(3,053)		649
Foreign currency exchange rate changes	(541)		2,175
Corporate contributions	400		503
Gross benefits paid	(3,043)		(2,668)
Fair value of plan assets, Ending balance	36,101		42,338
Other Postretirement Benefit Plans [Member]
Change in plan assets:
Corporate contributions	372		423
Participant contributions	45		42
Gross benefits paid	$ (417)		$ (465)