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Employee Benefit Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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   $ 19,000 $ 18,500  
Employer matching contributions to defined contribution plan   0 0  
Employee Age Fifty and Above [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Amount of employee contribution to defined contribution plan   25,000 24,500  
Pension Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Benefit obligations in excess of the fair value of plan assets       $ 52,197,520
Contributions to the plan     213,532  
Pension plan termination date May 31, 2017      
Payments to acquire annuities $ 52,000,000      
Supplemental Employee Retirement Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Benefit obligations in excess of the fair value of plan assets   $ 9,723,866 9,038,825 $ 9,616,702
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   $ 367,989 356,354  
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   $ 9,700,000 9,000,000  
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     $ 1,000,000