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Acquisitions and Dispositions - Schedule of Recognized Identified Assets Exchanged (Detail) - USD ($)			12 Months Ended
	Dec. 19, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]
Goodwill		$ 3,393,234	$ 15,275,264	$ 3,393,234
Less cash consideration			(12,000,000)
Gain on exchange			$ 11,803,585
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment		806,970		806,970
FCC broadcasting license		35,943,600		35,943,600
Goodwill		11,882,030		11,882,030
Other intangibles		267,400		267,400
Fair value of assets received		48,900,000		48,900,000
Less cash consideration	$ (12,000,000)	(12,000,000)		(12,000,000)
Fair value of assets given up		36,900,000		36,900,000
Carrying amount of assets of exchanged radio station		(25,096,415)		(25,096,415)
Gain on exchange		$ 11,803,585		$ 11,803,585

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