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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost (income) $ (329) $ (394) $ (992) $ (1,178)
United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1,731 1,235 5,193 3,704
Expected return on plan assets (2,133) (2,201) (6,399) (6,602)
Amortization of net actuarial loss (6) 577 (18) 1,731
Net periodic benefit cost (income) (408) (389) (1,224) (1,167)
United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 171 86 504 282
Expected return on plan assets (177) (93) (522) (300)
Amortization of net actuarial loss 85 2 250 7
Net periodic benefit cost (income) $ 79 $ (5) $ 232 $ (11)