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Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost $ (252) $ (412) $ (760) $ (1,239)
United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1,700 1,651 5,100 4,954
Expected return on plan assets (2,002) (2,120) (6,007) (6,360)
Amortization of net actuarial loss (19) (3) (57) (9)
Net periodic benefit cost (321) (472) (964) (1,415)
United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 179 165 525 486
Expected return on plan assets (208) (187) (608) (552)
Amortization of net actuarial loss 98 82 287 242
Net periodic benefit cost $ 69 $ 60 $ 204 $ 176