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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Nov. 14, 2019 | Oct. 25, 2019 | Aug. 31, 2019 | Mar. 28, 2019 | Mar. 15, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 13, 2019 | Apr. 03, 2015 | Apr. 04, 2014 | Apr. 10, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  |  | $ 4,439,710 | $ 20,657,360 |  |  |  |
Asset purchase agreement, cash purchase price |  |  |  |  |  |  |  |  |  |  | 17,264,484 |  |  |  |
Business acquisition,transaction expenses | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  |  |  |  |  | 4,631,566 | 26,349,462 |  |  |  |
Business acquisition liabilitites assumed |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00%
Transaction Costs | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in noncash or part noncash acquisitions value of liabilities assumed |  |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |
Renegades Holdings, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition acquisition of ownership interest |  |  |  |  |  |  | 51.00% |  |  | 51.00% |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 45.00% |  | 45.00% |  |  | 45.00% | 51.00% |  |  |
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 |  |  |  |  |  |  |  |  |  |
Land [Member] | Las Vegas NV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | $ 7,900,000 |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  | $ 13,500,000 |  |  |  |
Land [Member] | Boca Raton, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | 6,500,000 |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |
Land [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  |  |  |  |  | $ 4,650,000 |  |  |  |  |
Radio Tower Member [Member] | Tampa FL And New Jersey Member [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
WXTU-FM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset purchase agreement, cash purchase price |  |  | $ 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition partially financed by borrowings |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
WDMK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition partially funded in cash |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition,transaction expenses |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Transaction Costs |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Out Laws [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition acquisition of ownership interest |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Out Laws [Member] | Franchise Fees Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition liabilitites assumed | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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