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Acquisitions and Dispositions - Schedule of Purchase Price Allocation (Detail) - USD ($)
 12 Months Ended
Nov. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Gain on merger     $ (44,281,066)
Cash   $ 12,000,000  
Greater Media Inc. [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents $ 7,683,950    
Accounts receivable 29,889,677    
Prepaid expenses 1,710,924    
Other current assets 541,460    
Property and equipment 40,642,648    
FCC broadcasting licenses 263,260,200    
Other intangibles, net 2,790,524    
Other assets 676,632    
Accounts payable (429,042)    
Other current liabilities (16,685,309)    
Long-term debt (82,177,895)    
Deferred tax liabilities (76,050,112)    
Other long-term liabilities (13,709,261)    
Net assets acquired 158,144,396    
Gain on merger (44,281,066)    
Purchase price 113,863,330    
Cash 94,444,148    
Stock issued 21,865,506    
Estimated tower sale adjustment (3,357,916)    
Stock issued in escrow 4,164,859    
Estimated working capital adjustment (3,253,267)    
Purchase price $ 113,863,330