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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, 2017	Dec. 31, 2016
Pension Plan [Member]
Information for Pension Plans with an Accumulated Benefit Obligation in excess of Plan Assets
Projected benefit obligation	$ 52,197,520	$ 87,861,806
Accumulated benefit obligation	52,197,520	87,861,806
Fair value of plan assets	52,203,372	83,868,508
Supplemental Employee Retirement Plan [Member]
Information for Pension Plans with an Accumulated Benefit Obligation in excess of Plan Assets
Projected benefit obligation	9,616,702	8,751,848
Accumulated benefit obligation	$ 9,616,702	$ 8,751,848

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- References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920

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- Definition

Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921

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