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FCC Broadcasting Licenses - Carrying Amount of Broadcasting Licenses (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 27, 2018
FCC Broadcasting Licenses [Line Items] |  |  |
Beginning Balance | $ 489,186,679 |  |
Ending Balance | 516,735,554 | $ 489,186,679 |
FCC Broadcasting License [Member] |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |
Beginning Balance | 489,186,679 | 451,811,500 |
Acquisitions of translator licenses | 202,675 | 1,431,579 |
Ending Balance | 516,735,554 | 489,186,679 |
Greater Media Inc. [Member] | FCC Broadcasting License [Member] |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |
Assets acquisitions |  | $ 35,943,600 |
WXTU-FM [Member] |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |
Assets acquisitions |  |  | $ 27,346,200
WXTU-FM [Member] | FCC Broadcasting License [Member] |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |
Assets acquisitions | $ 27,346,200 |  |

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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition. + References No definition available. + Details
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