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Acquisitions and Dispositions - Summary of Assets Held for Sale (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]    
Assets held for sale   $ 36,457,119
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment, net $ 3,480,655  
FCC broadcasting licenses 30,924,980  
Goodwill 1,943,349  
Other intangibles 108,135  
Assets held for sale 36,457,119  
WFNZAM [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment, net 1,702,847  
FCC broadcasting licenses 2,166,400  
Other intangibles 108,135  
Assets held for sale 3,977,382  
New Bern [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment, net 1,400,615  
FCC broadcasting licenses 3,998,940  
Goodwill 1,943,349  
Assets held for sale 7,342,904  
WMJX [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment, net 377,193  
FCC broadcasting licenses 24,759,640  
Assets held for sale $ 25,136,833