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Stock-based Compensation Plans - Additional Information 5 (Detail) - Other Post Retirement Benefits | Dec. 31, 2020 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments for the five year period 2021 through 2025 | $ 914,000
Expected future benefit payments for the five year period 2026 through 2030 | 371,000
Estimated prior service cost amortized from accumulated other comprehensive loss into statements of operation in 2021 | $ 369,000

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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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