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Pensions and Other Post-retirement Benefits - Schedule of Reconciliation of Level Three Assets (Detail) - Significant Unobservable Inputs (Level 3) - Insurance contracts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at January 1 | $ 4,454 | $ 4,211
Net realized and unrealized gains | 208 | (119)
Net purchases, issuances and settlements | 960 | 362
Fair value of plan assets at December 31 | $ 5,622 | $ 4,454

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