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Postretirement Benefit Plans - Fair Value Changes Within Asset Categories for which Fair Value Measurements Use Significant Unobservable Inputs Level 3 (Detail) - Insurance Contracts [Member] - United Kingdom [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ 760 | $ 677
Sale proceeds (benefit payments) | (129) | (123)
Change in unrealized gain | 13 | 169
Foreign exchange impact | (11) | 37
Ending balance | $ 633 | $ 760

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis foreign exchange impact. + References No definition available. + Details
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