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GOODWILL AND RADIO BROADCASTING LICENSES (Details 1) - Radio Marketing Units [Member] - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]    
Pre-tax impairment charge [1] $ 0 $ 0
Discount Rate [1] 9.00% 9.00%
Year 1 Market Revenue Growth Rate Range [1]   0.60%
Long-term Market Revenue Growth Rate Range (Years 6 - 10) [1]   1.00%
Mature Market Share Range [1]   9.50%
Minimum [Member]    
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]    
Year 1 Market Revenue Growth Rate Range [1] (5.90%)  
Long-term Market Revenue Growth Rate Range (Years 6 - 10) [1] 1.00%  
Mature Market Share Range [1] 9.00%  
Operating Profit Margin Range [1] 26.60% 18.20%
Maximum [Member]    
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]    
Year 1 Market Revenue Growth Rate Range [1] 30.00%  
Long-term Market Revenue Growth Rate Range (Years 6 - 10) [1] 1.50%  
Mature Market Share Range [1] 14.80%  
Operating Profit Margin Range [1] 52.60% 33.90%
[1] Reflects changes only to the key assumptions used in the interim testing for certain units of accounting.