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Subsequent Events (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Mar. 14, 2018
Feb. 04, 2018
Feb. 28, 2018
Mar. 14, 2018
Dec. 31, 2018
Feb. 06, 2018
HC2 Broadcasting Holdings, Inc | Credit Agreement Amendment | Bridge Loan | Subsequent Event            
Subsequent Event [Line Items]            
Additional aggregate principal amount   $ 27,000,000.0        
Outstanding debt $ 102,000,000     $ 102,000,000   $ 42,000,000
Northstar's Broadcast Television Stations | HC2 Network Inc. | Subsequent Event            
Subsequent Event [Line Items]            
Consideration paid     $ 33,000,000      
Series Of Acquisitions Agreed To In December 2017 | HC2 Broadcasting Holdings, Inc | Subsequent Event            
Subsequent Event [Line Items]            
Consideration paid $ 4,600,000     8,300,000    
Series Of Acquisitions Agreed To Subsequent To December 2017 | HC2 Broadcasting Holdings, Inc | Subsequent Event            
Subsequent Event [Line Items]            
Consideration paid       $ 8,700,000    
Scenario, Forecast | ANG            
Subsequent Event [Line Items]            
AFETC credit         $ 2,600,000