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Acquisitions and Dispositions - Additional Information (Detail) - USD ($)					3 Months Ended	9 Months Ended
	Aug. 31, 2019	Mar. 28, 2019	Mar. 15, 2019	Sep. 27, 2018	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Gain on sale of assets						$ 3,545,755
Asset purchase agreement, cash purchase price						13,500,000	$ 39,520,000
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
WDMK [Member]
Business Acquisition [Line Items]
Asset purchase agreement, cash purchase price	$ 13,500,000
Business acquisition partially financed by borrowings	10,000,000
Business acquisition partially funded in cash	3,500,000
Business acquisition,transaction expenses	$ 200,000

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