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Acquisitions and Dispositions - Schedule of Purchase Price Allocation (Detail) - USD ($)
Sep. 30, 2018
Sep. 27, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 25,377,447   $ 15,275,264
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