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Acquisitions and Dispositions - Schedule of Recognized Identified Assets Exchanged (Detail) - USD ($)
12 Months Ended
Dec. 19, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]        
Goodwill   $ 25,377,447 $ 15,275,264 $ 3,393,234
Less cash consideration     (12,000,000)  
Gain on exchange     $ 11,803,585  
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Property and equipment   806,970    
FCC broadcasting license   35,943,600    
Goodwill   11,882,030    
Other intangibles   267,400    
Fair value of assets received   48,900,000    
Less cash consideration $ (12,000,000) (12,000,000)    
Fair value of assets given up   36,900,000    
Carrying amount of assets of exchanged radio station   (25,096,415)    
Gain on exchange   $ 11,803,585