Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail) £ in Thousands, $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)
Foreign Defined Benefits Pension Plans [Member]
Funded status of the plans:
Fair value of plan assets	$ 36,101	£ 28,800	$ 42,338	£ 33,257
Defined Benefit Pension Plan [Member] | U.S. [Member]
Funded status of the plans:
Fair value of plan assets	158,704		163,929		$ 161,374
Less benefit obligations	176,161		194,365		193,670
Funded status at December 31	(17,457)		(30,436)
Defined Benefit Pension Plan [Member] | Foreign Defined Benefits Pension Plans [Member]
Funded status of the plans:
Fair value of plan assets	36,101		42,338		41,679
Less benefit obligations	37,618		42,447		39,319
Funded status at December 31	(1,517)		(109)
Other Postretirement Benefit Plans [Member]
Funded status of the plans:
Less benefit obligations	7,068		7,748		$ 7,644
Funded status at December 31	$ (7,068)		$ (7,748)