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Employee Benefit Plans - Summary of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial (gain) loss	$ (3,395,903)	$ 1,767,058
Recognized actuarial (gain) loss due to settlements	636,121
Total recognized in other comprehensive income (before tax effects)	(2,759,782)	1,767,058
Total recognized in net benefit cost and other comprehensive income (before tax effects)	(3,999,150)	1,297,165
Supplemental Employee Retirement Plan [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial (gain) loss	836,680	(415,416)
Total recognized in other comprehensive income (before tax effects)	836,680	(415,416)
Total recognized in net benefit cost and other comprehensive income (before tax effects)	1,176,942	(363,720)
Postretirement Benefits [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial (gain) loss	(67,772)	(103,396)
Recognized actuarial (gain) loss	2,079
Prior service cost (credit)	(1,678,920)
Prior service cost (credit) due to curtailment	1,678,920
Recognized actuarial (gain) loss due to settlements	169,089
Total recognized in other comprehensive income (before tax effects)	103,396	(103,396)
Total recognized in net benefit cost and other comprehensive income (before tax effects)	$ (1,708,563)	$ (84,130)

X

- Definition

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

+ References

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-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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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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-Topic 220
-SubTopic 10
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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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