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Acquisitions and Dispositions - Schedule of Recognized Identified Assets Exchanged (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 19, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Goodwill |  | $ 25,377,447 | $ 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 |  |
FCC broadcasting license |  | 35,943,600 |  |
Goodwill |  | 11,882,030 |  |
Other intangibles |  | 267,400 |  |
Fair value of assets received |  | 48,900,000 |  |
Less cash consideration | $ (12,000,000) | (12,000,000) |  |
Fair value of assets given up |  | 36,900,000 |  |
Carrying amount of assets of exchanged radio station |  | (25,096,415) |  |
Gain on exchange |  | $ 11,803,585 |  |

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