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Benefit Plans - Summary of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Benefits [Abstract] |  |  |
Net loss | $ 822 | $ 436 | $ 275

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