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Pension Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |  |  |
Amount of contributions to contributory plan | $ 56,300,000 | $ 56,600,000 | $ 50,100,000
Accumulated benefit obligation | 117,500,000 | 108,300,000 |
Fair value of plan assets exceeded accumulated benefit obligation | 2,700,000 |  |
Fair value of plan accumulated benefit obligation exceeds plan assets |  | $ 3,700,000 |
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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