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Goodwill and Other Intangible Assets - Goodwill by business segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of activity related to goodwill by business segment          
Gross balance   $ 1,539,172 $ 1,101,330 $ 1,023,266 $ 813,694
Accumulated impairment losses   (267,317) (267,317) (267,317) (237,914)
Goodwill [Roll Forward]          
Balance, beginning of period   834,013 755,949 575,780  
Impairment charge $ (29,400)        
Balance, end of period   1,271,855 834,013 755,949  
Local Media          
Summary of activity related to goodwill by business segment          
Gross balance   1,143,859 708,133 708,133 708,133
Accumulated impairment losses   (216,914) (216,914) (216,914) (216,914)
Goodwill [Roll Forward]          
Balance, beginning of period   491,219 491,219 491,219  
Balance, end of period   926,945 491,219 491,219  
National Media          
Summary of activity related to goodwill by business segment          
Gross balance   395,313 393,197 315,133 105,561
Accumulated impairment losses   (50,403) (50,403) (50,403) $ (21,000)
Goodwill [Roll Forward]          
Balance, beginning of period   342,794 264,730 84,561  
Balance, end of period   344,910 342,794 264,730  
Cracked acquisition          
Goodwill [Roll Forward]          
Impairment charge       (29,403)  
Cracked acquisition | National Media          
Goodwill [Roll Forward]          
Impairment charge       (29,403)  
Katz Broadcasting Group          
Goodwill [Roll Forward]          
Acquisitions       209,572  
Goodwill, Purchase Accounting Adjustments     (5,812)    
Katz Broadcasting Group | National Media          
Goodwill [Roll Forward]          
Acquisitions       $ 209,572  
Goodwill, Purchase Accounting Adjustments     (5,812)    
Triton Digital Canada, Inc.          
Goodwill [Roll Forward]          
Acquisitions     83,876    
Goodwill, Purchase Accounting Adjustments   (3,220)      
Triton Digital Canada, Inc. | National Media          
Goodwill [Roll Forward]          
Acquisitions     $ 83,876    
Goodwill, Purchase Accounting Adjustments   (3,220)      
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc.          
Goodwill [Roll Forward]          
Acquisitions   435,726      
Balance, end of period   435,726      
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Local Media          
Goodwill [Roll Forward]          
Acquisitions   435,726      
Omny Studio          
Goodwill [Roll Forward]          
Acquisitions   5,336      
Omny Studio | National Media          
Goodwill [Roll Forward]          
Acquisitions   $ 5,336