Postretirement Benefit Plans - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Non-current asset	$ 1,945	$ 5,924
Current liability	(145)	(167)
Non-current liability	(1,253)	(5,204)
Net amount recognized	547	553
United Kingdom [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Non-current asset	2,150	1,775
Net amount recognized	$ 2,150	$ 1,775