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Employee Benefit Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 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%  
Employer matching contributions to defined contribution plan   $ 0 $ 0
Defined benefit plan benefit obligation   $ (1,812,448)  
Pension Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
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.  
Pension plan termination date   May 31, 2017  
Contributions to the plan   $ 0 0
Benefit obligations in excess of the fair value of plan assets   $ 52,197,520 87,861,806
Pension Plan [Member] | Subsequent Event [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Contributions to the plan $ 200,000    
Payments to acquire annuities $ 52,000,000    
Pension Plan [Member] | Cash [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Cash equivalencies   35.00%  
Pension Plan [Member] | Fixed Income [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Cash equivalencies   65.00%  
Supplemental Employee Retirement Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
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   $ 312,088 38,550
Benefit obligations in excess of the fair value of plan assets   $ 9,616,702 8,751,848
Greater Media Postretirement Medical and Life Insurance Benefits Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
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.  
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)  
Other Noncurrent Liabilities [Member] | Pension Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Benefit obligation in excess of the fair value of plan assets     4,000,000
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   $ 9,600,000 8,800,000
Other Noncurrent Liabilities [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