Stock-based Compensation Plans - Additional Information 5 (Detail) - Other Post Retirement Benefits	Dec. 31, 2020 USD ($)
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

Defined benefit plan expected future benefit payments first five years.

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- Definition

Defined benefit plan expected future benefit payments next five years.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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