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Retirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net (gain) loss | $ (590) | $ (575) | $ (461)
Transition obligation | 244 | 305 | 364
Total | (346) | $ (270) | $ (97)
Postretirement Benefit Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net (gain) loss | (108) |  |
Transition obligation | 76 |  |
Total | $ (32) |  |

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