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Pensions and Other Post-retirement Benefits - Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis by Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Insurance contracts | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 3,334 | $ 5,622 | $ 4,454
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 580,364 | 563,449 | $ 514,218
Fair Value, Measurements, Recurring | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 580,364 | 563,449 |
NAV | 104,893 | 104,639 |
Fair Value, Measurements, Recurring | Pension Plan | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 416,892 | 378,573 |
Fair Value, Measurements, Recurring | Pension Plan | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 55,245 | 74,615 |
Fair Value, Measurements, Recurring | Pension Plan | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,334 | 5,622 |
Fair Value, Measurements, Recurring | Pension Plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 375,001 | 327,699 |
NAV | 56,803 | 45,441 |
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 318,198 | 282,258 |
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 152,258 | 169,321 |
NAV | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 97,013 | 94,706 |
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 55,245 | 74,615 |
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 42,182 | 50,553 |
NAV | 42,182 | 50,553 |
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,334 | 5,622 |
NAV | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,334 | 5,622 |
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,589 | 10,254 |
NAV | 5,908 | 8,645 |
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,681 | 1,609 |
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 0 | $ 0 |

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