v3.25.4
Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 15,100 $ 7,900 $ 7,900
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 13,156 7,523 7,515
Interest cost 58,820 45,513 47,638
Expected return on plan assets (72,745) (60,291) (60,437)
Amortization of prior service cost 3,152 3,280 3,238
Recognized net actuarial loss (gain) (8,362) 9,485 31,755
Net periodic benefit cost (income) (5,979) 5,510 29,709
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,990 384 338
Interest cost 3,948 2,012 2,139
Expected return on plan assets (1,945) (1,948) (2,536)
Amortization of prior service cost 88 45 40
Recognized net actuarial loss (gain) 1,811 1,122 (946)
Net periodic benefit cost (income) $ 5,892 $ 1,615 $ (965)