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Schedule of Market Values of Pension Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 93,415 | $ 98,415 | $ 96,627
Equity Securities U.S. Large Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5,131 | 5,423 |
Equity Securities U.S. Mid Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,351 | 1,480 |
Equity Securities U.S. Small Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,259 | 1,491 |
Equity Securities International Developed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,746 | 3,943 |
Equity Securities Emerging Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,291 | 2,540 |
Fixed Income Securities Core Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 28,175 | 17,492 |
Fixed Income Securities Long Duration Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 50,674 | 65,289 |
Cash Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 788 | $ 757 |

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