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Intangible Assets and Goodwill - Additional Information (Details)
3 Months Ended 12 Months Ended
Jan. 16, 2018
ReportingUnit
Jan. 15, 2018
ReportingUnit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
ReportingUnit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]              
Assets impairment charge       $ 8,500,000      
Goodwill impairment charges         $ 19,911,000 $ 11,517,000 $ 15,262,000
Goodwill     $ 2,167,954,000 2,142,846,000 $ 2,167,954,000 2,142,846,000 $ 473,304,000
Broadcast [Member]              
Finite-Lived Intangible Assets [Line Items]              
Number of business reporting units | ReportingUnit         1    
Goodwill     $ 2,125,479,000 2,122,935,000 $ 2,125,479,000 2,122,935,000  
All Other Segments [Member]              
Finite-Lived Intangible Assets [Line Items]              
Number of business reporting units | ReportingUnit 4 3     4    
Terminal growth rate     2.50%        
Goodwill       19,900,000   $ 19,900,000  
All Other Segments [Member] | Three Digital Reporting Units [Member]              
Finite-Lived Intangible Assets [Line Items]              
Goodwill     $ 0   $ 0    
All Other Segments [Member] | One Digital Reporting Unit [Member]              
Finite-Lived Intangible Assets [Line Items]              
Goodwill     $ 42,100,000   $ 42,100,000    
All Other Segments [Member] | Measurement Input Discount Rate [Member]              
Finite-Lived Intangible Assets [Line Items]              
Discount rate     0.150   0.150    
All Other Segments [Member] | Quantitative Impairment Test Failed [Member]              
Finite-Lived Intangible Assets [Line Items]              
Goodwill impairment charges     $ 19,900,000 $ 11,500,000      
All Other Segments [Member] | Minimum [Member]              
Finite-Lived Intangible Assets [Line Items]              
Compound annual growth rate     4.40%        
Initial year operating profit margin     1.10%        
Operating profit margin     6.30%        
Income tax rate     21.00%        
Revenue multiplier adjusted for forecasted operating performance     0.2        
All Other Segments [Member] | Maximum [Member]              
Finite-Lived Intangible Assets [Line Items]              
Compound annual growth rate     5.00%        
Initial year operating profit margin     5.90%        
Operating profit margin     13.70%        
Income tax rate     28.70%        
Revenue multiplier adjusted for forecasted operating performance     0.4