| Broadcast Licenses - Additional Information (Detail) - Broadcast Licenses [Member] $ in Thousands | 3 Months Ended | 
|---|---|
| Mar. 31, 2022  USD ($) | |
| Indefinite-lived Intangible Assets [Line Items] | |
| License renewable term | 8 years | 
| Impairment charge | $ 0 | 
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- Definition License renewal term. No definition available. 
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| X | ||||||||||
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
 | 
| X | ||||||||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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| X | ||||||||||
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- Details 
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