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Acquisitions and Dispositions - Additional Information (Detail) - USD ($)				3 Months Ended
	Mar. 28, 2019	Mar. 15, 2019	Sep. 27, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Gain on sale of assets				$ 3,545,755
Proceeds from sale of assets				3,800,000
Augusta GA [Member]
Business Acquisition [Line Items]
Gain on sale of assets				400,000
Proceeds from sale of assets	$ 500,000
Operating and Broadcast Rights [Member] | Clearwire [Member]
Business Acquisition [Line Items]
Gain on cancelation of license				$ 3,100,000
Proceeds from cancellation of license		$ 3,300,000
WXTU-FM [Member]
Business Acquisition [Line Items]
Merger agreement date			Sep. 27, 2018
Asset purchase agreement, cash purchase price			$ 38,000,000
Business acquisition partially financed by borrowings			35,000,000
Business acquisition partially funded in cash			$ 3,000,000

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