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Pension Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Benefits [Abstract] |  |  |
Amount of contributions to contributory plan | $ 82,100,000 | $ 73,900,000 | $ 72,000,000
Accumulated benefit obligation | 78,400,000 | 85,600,000 |
Fair value of plan assets exceeded accumulated benefit obligation | 15,000,000.0 | $ 12,800,000 |
Estimated net loss that will be amortized from accumulated other comprehensive income over the next fiscal year | 0 |  |
Estimated prior service cost that will be amortized from accumulated other comprehensive income over the next fiscal year | $ 0 |  |

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