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Related Party Transactions - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Jun. 18, 2018 USD ($) | May 03, 2018 Tower | Feb. 22, 2017 USD ($) | May 03, 2016 USD ($) | Nov. 17, 2015 USD ($) Tower | Oct. 16, 2015 USD ($) | Apr. 03, 2015 USD ($) | Apr. 04, 2014 USD ($) | Apr. 10, 2013 USD ($) | Mar. 25, 2011 USD ($) shares | Aug. 04, 2006 Radio-Stations | Jul. 31, 2012 USD ($) | Feb. 14, 2012 USD ($) | Dec. 31, 2018 USD ($) Radio-Stations | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Tower
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,800,000 | $ 11,000,000 |  |
Proceeds from sale of tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000,000 |  |
Percentage of outstanding units ownership interest in Investee | 20.00% |  |  |  |  |  | 20.00% | 20.00% | 20.00% |  |  |  |  |  |  |  |
Conversion of note receivable and accrued interest to equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 187,618 |  |  |
Beasley Broadcasting Management, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 200,000 |  |
Beasley Family Towers Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000 | 12,000 |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2025
Deferred gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000
Beasley Family Towers Inc [Member] | April 30, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2021 |  |  |
Number of radio towers sold to unrelated party | Tower |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Monthly repayment of prepaid rent to related party |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of prepaid rent to related party |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 100,000 |
Beasley Family Towers Inc [Member] | April 30, 2021 [Member] | Prepaid Rent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expense paid by related party |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Beasley Family Towers Inc [Member] | December 28, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | 400,000 |  |
Number of radio stations for which radio tower leased | Radio-Stations |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 28, 2020 |  |  |
Beasley Family Towers Inc [Member] | Lease Agreements Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Number of radio towers sold for radio station | Tower |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2027 |  |  |
Beasley Family Towers Inc [Member] | Augusta GA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of radio towers sold for radio station | Tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Proceeds from sale of tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000
Beasley Family Towers Inc [Member] | Boca Raton, FL [Member] | April 30, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of radio stations for which radio tower leased | Radio-Stations |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Beasley Family Towers Inc [Member] | Tampa Saint Petersburg FL [Member] | Lease Agreements Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of radio stations for which radio tower leased | Tower |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GGB Augusta, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000 | 42,000 |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 01, 2023 |  |  |
GGB Estero, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | 200,000 |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2019 |  |  |
GGB Las Vegas, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | 200,000 |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2023 |  |  |
LN2 DB, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional contribution to related party | $ 150,000 |  | $ 150,000 | $ 166,667 |  |  | $ 166,667 | $ 104,167 | $ 104,167 | $ 250,000 |  | $ 104,167 | $ 62,500 |  |  |  |
Related party stock purchase | shares |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |
Percentage of outstanding units ownership interest in Investee |  |  |  | 20.00% |  |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |
Note bearing interest rate |  |  | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of note receivable and accrued interest to equity investment | $ 187,618 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wintersrun Communications Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease or rental expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | 100,000 |  |
Number of radio stations for which radio tower leased | Radio-Stations |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2025
Deferred gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000
Monthly repayment of prepaid rent to related party |  |  |  |  |  | $ 2,559 |  |  |  |  |  |  |  |  |  |  |
Repayment of prepaid rent to related party |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,000 | $ 31,000 |  |
Wintersrun Communications Inc [Member] | Prepaid Rent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expense paid by related party |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Wintersrun Communications Inc [Member] | Charlotte, NC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of radio towers sold for radio station | Tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Proceeds from sale of tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000

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