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Employee Benefit Plans - Summary of Change in Benefit Obligation (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Change in Projected Benefit Obligation
Benefit obligation at beginning of year	$ 52,197,520	$ 87,861,806
Interest cost	28,282	2,958,903
Actuarial (gain) loss	77,121	(2,426,328)
Settlements	(52,057,333)	(33,447,301)
Benefits paid	(245,590)	(2,749,560)
Benefit obligation at end of year		52,197,520
Supplemental Employee Retirement Plan [Member]
Change in Projected Benefit Obligation
Benefit obligation at beginning of year	9,616,702	8,751,848
Interest cost	319,143	340,262
Actuarial (gain) loss	(540,666)	836,680
Benefits paid	(356,354)	(312,088)
Benefit obligation at end of year	$ 9,038,825	9,616,702
Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Benefit obligation at beginning of year		1,756,423
Service cost		11,860
Interest cost		26,269
Amendments		(1,678,920)
Actuarial (gain) loss		(67,772)
Benefits paid		$ (47,860)

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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