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Employee Benefit Plans - Summary of Information for Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Information for Pension Plans with an Accumulated Benefit Obligation in excess of Plan Assets
Projected benefit obligation		$ 52,197,520
Accumulated benefit obligation		52,197,520
Fair value of plan assets		52,203,372
Supplemental Employee Retirement Plan [Member]
Information for Pension Plans with an Accumulated Benefit Obligation in excess of Plan Assets
Projected benefit obligation	$ 9,038,825	9,616,702
Accumulated benefit obligation	$ 9,038,825	$ 9,616,702

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

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- Definition

Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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