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Acquisitions and Dispositions - Schedule of Purchase Price Allocation (Detail) - USD ($) | Dec. 31, 2018 | Sep. 27, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 25,377,447 |  | $ 15,275,264 | $ 3,393,234
WXTU-FM [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Property and equipment |  | $ 357,734 |  |
FCC broadcasting license |  | 27,346,200 |  |
Goodwill |  | 10,102,183 |  |
Other intangibles |  | 193,883 |  |
Net assets acquired |  | $ 38,000,000 |  |

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