Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail) £ in Thousands, $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)	Dec. 31, 2019 USD ($)
Foreign Defined Benefits Pension Plans [Member]
Funded status of the plans:
Fair value of plan assets	$ 71,614	£ 53,008	$ 66,957	£ 49,056
Defined Benefit Pension Plan [Member] | U.S. [Member]
Funded status of the plans:
Fair value of plan assets	214,937		210,880		$ 195,667
Less benefit obligations	260,301		273,776		261,902
Funded status at December 31	(45,364)		(62,896)
Defined Benefit Pension Plan [Member] | Foreign Defined Benefits Pension Plans [Member]
Funded status of the plans:
Fair value of plan assets	71,614		66,957		57,900
Less benefit obligations	67,007		69,923		62,339
Funded status at December 31	4,607		(2,966)
Other Postretirement Benefit Plans [Member]
Funded status of the plans:
Fair value of plan assets	0		0		0
Less benefit obligations	10,430		11,410		$ 11,398
Funded status at December 31	$ (10,430)		$ (11,410)