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Employee Benefit Plans - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Minimum percentage of employee contribution to defined contribution plan		1.00%
Amount of employee contribution to defined contribution plan		$ 18,500	$ 18,000
Employer matching contributions to defined contribution plan		0	0
Defined benefit plan benefit obligation		0	(1,812,448)
Employee Age Fifty and Above [Member]
Defined Contribution Plan Disclosure [Line Items]
Amount of employee contribution to defined contribution plan		24,500	24,000
Pension Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit obligations in excess of the fair value of plan assets			52,197,520	$ 87,861,806
Contributions to the plan		213,532	0
Pension plan termination date	May 31, 2017
Payments to acquire annuities	$ 52,000,000
Defined benefit plan benefit obligation		(992,623)
Supplemental Employee Retirement Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit obligations in excess of the fair value of plan assets		$ 9,038,825	9,616,702	$ 8,751,848
Defined benefit plan, assumption used to calculate discount rate description		The discount rate is based on matching the projected cash flows of the plan to the Citigroup Pension Discount Curve.
Contributions to the plan		$ 356,354	312,088
Other Noncurrent Liabilities [Member] | Supplemental Employee Retirement Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit obligations in excess of the fair value of plan assets		$ 9,000,000	9,600,000
Corporate General and Administrative Expenses [Member] | Greater Media Postretirement Medical and Life Insurance Benefits Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined benefit plan benefit obligation			$ (1,800,000)

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Description of assumptions used to calculate benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, assumed discount rate, rate of compensation increase, expected long-term rate of return on plan assets, how rate was determined and source data used to support rate.

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