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Retirement Benefit Plans - Assets Measured at Fair Value on Recurring Basis for PBOP Plan (Detail) - Retirement Benefits - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | $ 58,402 | $ 51,892 | $ 44,770
Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | 25,908 | 23,025 |
Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | 32,494 | 28,867 |
Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | 58,402 | 51,892 |
Fair Value, Inputs, Level 1 | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | 25,908 | 23,025 |
Fair Value, Inputs, Level 1 | Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at fair value | $ 32,494 | $ 28,867 |

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