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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	Mar. 31, 2019	Sep. 30, 2019	May 05, 2020
Business Acquisition [Line Items]
Gain on sale of assets					$ 3,545,755
Asset purchase agreement, cash purchase price					13,500,000
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
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Land [Member]
Business Acquisition [Line Items]
Non current assets disposal consideration receivable						$ 4,700,000
WXTU-FM [Member]
Business Acquisition [Line Items]
Asset purchase agreement, cash purchase price	$ 13.5
Business acquisition partially financed by borrowings	10.0
Business acquisition partially funded in cash	3.5
Business acquisition,transaction expenses	$ 0.2

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