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Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Indefinite-lived and Finite-lived Intangible Assets [Line Items]      
Goodwill $ 11.5   $ 11.4
Increase in goodwill 0.1    
Amortization of intangible assets 0.4 $ 0.1  
FMG Valdosta, LLC and FMG Kentucky, LLC      
Indefinite-lived and Finite-lived Intangible Assets [Line Items]      
Goodwill acquired     11.4
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