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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

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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