Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)
Foreign Defined Benefits Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	$ 41,679	£ 34,475
Fair value of plan assets, Ending balance	42,338	£ 33,257	$ 41,679
Defined Benefit Pension Plan [Member] | U.S. [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	161,374		214,937
Actual return on plan assets	16,845		(39,147)
Corporate contributions	1,108		1,214
Gross benefits paid	(15,398)		(15,630)
Fair value of plan assets, Ending balance	163,929		161,374
Defined Benefit Pension Plan [Member] | Foreign Defined Benefits Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	41,679		71,614
Actual return on plan assets	649		(21,069)
Foreign currency exchange rate changes	2,175		(7,003)
Corporate contributions	503		506
Gross benefits paid	(2,668)		(2,369)
Fair value of plan assets, Ending balance	42,338		41,679
Other Postretirement Benefit Plans [Member]
Change in plan assets:
Corporate contributions	423		479
Participant contributions	42		30
Gross benefits paid	$ (465)		$ (509)