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Benefit Plans - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract] |  |
Service cost | $ 616,000 | $ 568,000
Periodic pension income | 1,300,000 | $ 700,000
Minimum required pension plan contribution | 5,200,000 |
Available credit balance | 64,200,000 |
Expected voluntary contribution for the year 2021 | $ 0 |

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