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Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Indefinite Lived And Finite Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 0.3 $ 0.4  
FMG Valdosta, LLC and FMG Kentucky, LLC | Trade Name      
Indefinite Lived And Finite Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired preliminary valuation 0.7    
FCC Licenses      
Indefinite Lived And Finite Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets, carrying amount $ 63.3   $ 63.3