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Acquisitions and Dispositions - Schedule of Purchase Price Allocation (Detail) - USD ($)
Dec. 31, 2018
Sep. 27, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 25,377,447   $ 15,275,264 $ 3,393,234
WXTU-FM [Member]        
Business Acquisition [Line Items]        
Property and equipment   $ 357,734    
FCC broadcasting license   27,346,200    
Goodwill   10,102,183    
Other intangibles   193,883    
Net assets acquired   $ 38,000,000