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Acquisitions - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 02, 2017
USD ($)
Jun. 06, 2016
USD ($)
show
Apr. 12, 2016
USD ($)
Oct. 01, 2015
USD ($)
Jul. 22, 2015
USD ($)
show
Apr. 01, 2015
USD ($)
radio_station
television_station
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                        
Goodwill             $ 755,949,000 $ 575,780,000 $ 755,949,000 $ 575,780,000 $ 544,787,000 $ 106,261,000
Shares issued for acquisition | shares                 0 0 26,350,993  
Goodwill, Acquired During Period                 $ 209,572,000      
KNIN [Member] | Raycom Media, Inc. [Member]                        
Business Acquisition [Line Items]                        
Business disposition, consideration to be received       $ 14,500,000                
Local Media                        
Business Acquisition [Line Items]                        
Goodwill             491,219,000 491,219,000 491,219,000 $ 491,219,000 $ 491,219,000 $ 77,279,000
Goodwill, Acquired During Period                 0      
Katz Broadcasting Group                        
Business Acquisition [Line Items]                        
Business acquisition, purchase price $ 292,000,000                      
Noncontrolling interest prior to acquisition 5.33%                      
Intangible assets acquired $ 32,300,000                      
Goodwill 209,572,000                      
Revenues from acquired operations             $ 41,000,000          
Gain on fair value remeasurement of acquisition                 $ 5,400,000      
Katz Broadcasting Group | Trade names                        
Business Acquisition [Line Items]                        
Intangible assets acquired $ 8,000,000                      
Estimated useful life 10 years                      
Katz Broadcasting Group | Advertiser relationships                        
Business Acquisition [Line Items]                        
Intangible assets acquired $ 24,000,000                      
Estimated useful life 5 years                      
2016 Stitcher acquisition                        
Business Acquisition [Line Items]                        
Business acquisition, purchase price   $ 4,500,000                    
Intangible assets acquired   $ 2,900,000                    
Number of podcast shows | show   65,000                    
Goodwill, Acquired During Period                   1,590,000    
2016 Stitcher acquisition | Computer software                        
Business Acquisition [Line Items]                        
Estimated useful life   3 years                    
2016 Stitcher acquisition | Local Media                        
Business Acquisition [Line Items]                        
Goodwill, Acquired During Period                   0    
2016 Cracked acquisition                        
Business Acquisition [Line Items]                        
Business acquisition, purchase price     $ 39,000,000                  
Intangible assets acquired     9,600,000                  
Goodwill     29,000,000                  
Revenues from acquired operations               $ 4,000,000        
Goodwill, Acquired During Period                   29,403,000    
2016 Cracked acquisition | Trade names                        
Business Acquisition [Line Items]                        
Intangible assets acquired     $ 7,600,000                  
Estimated useful life     20 years                  
2016 Cracked acquisition | Media content                        
Business Acquisition [Line Items]                        
Intangible assets acquired     $ 2,000,000                  
Estimated useful life     3 years                  
2016 Cracked acquisition | Local Media                        
Business Acquisition [Line Items]                        
Goodwill, Acquired During Period                   $ 0    
2015 Midroll acquisition                        
Business Acquisition [Line Items]                        
Business acquisition, purchase price         $ 50,000,000              
Intangible assets acquired         10,700,000              
Goodwill         $ 45,586,000              
Number of podcast shows | show         300              
Business acquisition, earnout provision         $ 10,000,000              
Earnout provision, payment term         3 years              
Earnout provision, fair value         $ 7,000,000              
Goodwill, Acquired During Period                     45,586,000  
2015 Midroll acquisition | Advertiser relationships                        
Business Acquisition [Line Items]                        
Intangible assets acquired         $ 7,000,000              
Estimated useful life         5 years              
2015 Midroll acquisition | Other intangible assets                        
Business Acquisition [Line Items]                        
Intangible assets acquired         $ 4,000,000              
2015 Midroll acquisition | Local Media                        
Business Acquisition [Line Items]                        
Goodwill, Acquired During Period                     0  
2015 Journal acquisition                        
Business Acquisition [Line Items]                        
Business acquisition, purchase price           $ 636,000,000            
Intangible assets acquired           294,800,000            
Goodwill           $ 456,440,000            
Number of television stations acquired | television_station           12            
Number of radio stations acquired | radio_station           34            
Goodwill, Acquired During Period                     415,440,000  
2015 Journal acquisition | Retransmission agreements, television network affiliate relationships, advertiser relationships                        
Business Acquisition [Line Items]                        
Intangible assets acquired           $ 183,000,000            
2015 Journal acquisition | Retransmission agreements, television network affiliate relationships, advertiser relationships | Minimum                        
Business Acquisition [Line Items]                        
Estimated useful life           10 years            
2015 Journal acquisition | Retransmission agreements, television network affiliate relationships, advertiser relationships | Maximum                        
Business Acquisition [Line Items]                        
Estimated useful life           20 years            
2015 Journal acquisition | FCC licenses                        
Business Acquisition [Line Items]                        
Intangible assets acquired           $ 112,000,000            
2015 Journal acquisition | Common Stock | Common stock, Class A                        
Business Acquisition [Line Items]                        
Shares issued for acquisition | shares           26,400,000            
2015 Journal acquisition | Local Media                        
Business Acquisition [Line Items]                        
Goodwill, Acquired During Period                     $ 415,440,000  
2015 Journal acquisition | Radio                        
Business Acquisition [Line Items]                        
Goodwill           $ 41,000,000