Postretirement Benefit Plans - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Non-current asset	$ 5,924	$ 8,627
Current liability	(167)	(308)
Non-current liability	(5,204)	(2,117)
Net amount recognized	553	6,202
United Kingdom [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Non-current asset	1,775	2,341
Net amount recognized	$ 1,775	$ 2,341