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Stock-based Compensation Plans - Additional Information 5 (Detail) - Other Post Retirement Benefits | Dec. 31, 2019 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments for the five year period 2020 through 2024 | $ 1,100,000
Expected future benefit payments for the five year period 2025 through 2029 | 433,000
Estimated prior service cost amortized from accumulated other comprehensive (loss) income into statements of operation in 2020 | $ 369,000

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