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Pension and Postretirement Benefits other than Pensions - Net Periodic Benefit Cost of Defined Benefit Plans and Other Postretirement Benefit Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
UNITED STATES | Pension Plan        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 128 126 384 2,071
Expected return on plan assets 0 0 0 (1,647)
Amortization of prior service cost credit and recognized actuarial gain (loss) 35 36 105 627
Defined Benefit Plan, Other Cost (Credit) 0 (2,216) 0 44,571
Net periodic benefit cost (income) 163 (2,054) 489 45,622
UNITED STATES | Other Postretirement Benefits Plan        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 5 6 15 18
Interest cost 144 142 432 426
Amortization of prior service cost credit and recognized actuarial gain (loss) (644) (730) (1,932) (2,190)
Net periodic benefit cost (income) (495) (582) (1,485) (1,746)
Non-U.S. | Pension Plan        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 640 585 1,847 1,774
Interest cost 1,244 1,202 3,600 3,613
Expected return on plan assets (205) (332) (606) (998)
Amortization of prior service cost credit and recognized actuarial gain (loss) 2 53 6 159
Defined Benefit Plan, Other Cost (Credit) 0 0 0 0
Net periodic benefit cost (income) 1,681 1,508 4,847 4,548
Non-U.S. | Other Postretirement Benefits Plan        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 72 45 213 134
Interest cost 189 192 558 577
Amortization of prior service cost credit and recognized actuarial gain (loss) 3 3 9 10
Net periodic benefit cost (income) $ 264 $ 240 $ 780 $ 721