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Acquisitions and Dispositions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 29, 2017
Dec. 19, 2017
May 01, 2017
Jan. 06, 2017
Dec. 31, 2016
Nov. 01, 2016
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Feb. 27, 2017
Business Acquisition [Line Items]                      
Payment for exchange of radio station                 $ 12,000,000    
Transaction expenses                 963,979 $ 6,381,198  
Proceeds from sale assets held for sale     $ 11,000,000 $ 24,000,000              
Gain on dispositions, net             $ (300,000)   3,707,993    
Translator license and equipment received as consideration     $ 300,000           332,000    
Gain on exchange                 11,803,585    
Goodwill         $ 3,393,234       15,275,264 3,393,234  
Finite lived intangible assets gross         1,397,771       1,665,171 1,397,771  
Sports Program Rights [Member]                      
Business Acquisition [Line Items]                      
Finite lived intangible assets gross                 267,400    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]                      
Business Acquisition [Line Items]                      
Business acquisition, pre tax income (loss)                 100,000 600,000  
Gain on disposition               $ 4,000,000 4,000,000    
Other disposition related expenses                 300,000    
Greater Media Inc. [Member]                      
Business Acquisition [Line Items]                      
Merger agreement date           Nov. 01, 2016          
Aggregate purchase price           $ 239,875,000          
Refinancing of outstanding debt and payment of certain transaction expenses           82,177,895          
Payment for exchange of radio station           $ 94,444,148          
Number of shares equal to payment to stockholders           5,422,993          
Fixed value of share           $ 4.61          
Cash proceeds to stockholders from sale of tower assets           $ 24,000,000          
Business acquisition, sales price           $ 28,000,000         $ 28,000,000
Business acquisition, number of shares expected to be returned 470,480         650,759          
Business acquisition fair value of shares returned         3,700,000 $ 3,400,000     6,300,000 3,700,000  
Estimate of net operating loss carry forwards                 3,600,000    
Greater Media Inc. [Member] | Shares Released from Escrow [Member]                      
Business Acquisition [Line Items]                      
Fair value of shares forfeited in escrow                 11,600,000    
Business acquisition, number of shares expected to be forfeited and canceled 867,679                    
Greater Media Inc. [Member] | Class A Common Stock [Member]                      
Business Acquisition [Line Items]                      
Proceeds to be paid to stockholders in shares           $ 25,000,000          
Fair value of share           $ 4.80          
Value of shares issuable upon acquisition           $ 26,000,000          
Greater Media Inc. [Member] | Class A Common Stock [Member] | Common Stock to be Held in Escrow [Member]                      
Business Acquisition [Line Items]                      
Proceeds to be paid to stockholders in shares           $ 4,200,000          
Number of shares equal to payment to stockholders           867,679          
Greater Media Inc. [Member] | Class A Common Stock [Member] | Shares Released from Escrow [Member]                      
Business Acquisition [Line Items]                      
Proceeds to be paid to stockholders in shares           $ 900,000          
Number of shares equal to payment to stockholders           189,915          
Fair value of shares forfeited in escrow         4,200,000 $ 3,300,000       4,200,000  
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member]                      
Business Acquisition [Line Items]                      
Payment for exchange of radio station   $ 12,000,000     12,000,000         12,000,000  
Business acquisition partially financed by borrowings   6,000,000                  
Business acquisition partially funded in cash   $ 6,000,000                  
Fair value of assets received         48,900,000         48,900,000  
Fair value of assets given up         36,900,000         36,900,000  
FCC broadcasting license         35,943,600         35,943,600  
Property and equipment         806,970         806,970  
Gain on exchange         11,803,585         11,803,585  
Business acquisition,transaction expenses         200,000         200,000  
Goodwill         $ 11,882,030         $ 11,882,030  
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Sports Program Rights [Member]                      
Business Acquisition [Line Items]                      
Finite lived intangible assets gross                 $ 300,000    
Estimated useful lives                 3 years