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Subsequent Events (Details) - USD ($)
12 Months Ended
Mar. 12, 2019
Jan. 11, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 22, 2019
Subsequent Event [Line Items]            
Preferred stock     $ 20,300,000 $ 26,300,000    
Purchase of property, plant and equipment     39,700,000 $ 31,900,000 $ 29,000,000  
Subsequent Event            
Subsequent Event [Line Items]            
Consideration paid $ 13,700,000          
HC2 Broadcasting Holdings, Inc | Senior Notes            
Subsequent Event [Line Items]            
Line of credit, maximum amount     $ 15,000,000.0      
HC2 Broadcasting Holdings, Inc | Senior Notes | Subsequent Event            
Subsequent Event [Line Items]            
Additional borrowing capacity           $ 7,500,000
Interest rate (as a percent)           8.50%
Line of credit, maximum amount           $ 50,000,000.0
Series A-2 shares issued and outstanding            
Subsequent Event [Line Items]            
Shares issued (in shares)     14,000 14,000    
CGI | Series A-2 shares issued and outstanding | Subsequent Event            
Subsequent Event [Line Items]            
Shares issued (in shares)   10,000        
Number of shares of preferred stock converted (in shares)   1,420,455        
Preferred stock   $ 1,700,000        
Broadcasting | Subsequent Event            
Subsequent Event [Line Items]            
Consideration paid 6,200,000          
Purchase of property, plant and equipment $ 300,000