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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Insurance contracts | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 5,622 | $ 4,454 | $ 4,211
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 563,449 | 514,218 | $ 651,986
Fair Value, Measurements, Recurring | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 563,449 | 514,218 |
NAV | 104,639 | 132,390 |
Fair Value, Measurements, Recurring | Pension Plan | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 378,573 | 308,237 |
Fair Value, Measurements, Recurring | Pension Plan | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 74,615 | 69,137 |
Fair Value, Measurements, Recurring | Pension Plan | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,622 | 4,454 |
Fair Value, Measurements, Recurring | Pension Plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 327,699 | 288,006 |
NAV | 45,441 | 44,583 |
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 | 282,258 | 243,423 |
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 | 169,321 | 132,659 |
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 | 94,706 | 63,522 |
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 74,615 | 69,137 |
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 | 50,553 | 79,853 |
NAV | 50,553 | 79,853 |
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 | 5,622 | 4,454 |
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 | 5,622 | 4,454 |
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,254 | 9,246 |
NAV | 8,645 | 7,954 |
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 | 1,609 | 1,292 |
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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