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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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- Definition Minimum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition 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. + References No definition available. + Details
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