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LONG-TERM DEBT - Receivables Based Credit Facility (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 18, 2018
Dec. 27, 2017
Dec. 24, 2017
Nov. 30, 2017
Feb. 28, 2018
Sep. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]                  
Total debt       $ 365,000,000     $ 20,649,181,000 $ 20,364,988,000  
Draws on credit facilities             100,000,000 100,000,000 $ 350,000,000
Repayments of line of credit             25,909,000 $ 2,100,000 $ 123,849,000
Maximum borrowing capacity             $ 550,000,000    
Borrowing base as a percent of eligible accounts receivable             97.50%    
Revolving credit facility                  
Line of Credit Facility [Line Items]                  
Borrowings outstanding under receivables based credit facility     $ 405,000,000 250,000,000     $ 0    
Amount drawn on debt       $ 65,000,000          
Credit facility term           5 years      
Maximum borrowing capacity           $ 75,000,000.0      
Receivables Based Credit Facility                  
Line of Credit Facility [Line Items]                  
Credit facility term       3 years          
Secured debt                  
Line of Credit Facility [Line Items]                  
Term loan       $ 300,000,000          
Amount drawn on debt       300,000,000          
Subsequent Event | Revolving credit facility                  
Line of Credit Facility [Line Items]                  
Borrowings outstanding under receivables based credit facility $ 430,000,000       $ 371,000,000        
iHeartCommunications                  
Line of Credit Facility [Line Items]                  
Credit facility term             3 years    
iHeartCommunications | Revolving credit facility                  
Line of Credit Facility [Line Items]                  
Borrowings outstanding under receivables based credit facility             $ 405,000,000    
Draws on credit facilities   $ 40,000,000 $ 40,000,000 65,000,000          
Maximum borrowing capacity       $ 250,000,000.0          
iHeartCommunications | LIBOR                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate       4.75%          
iHeartCommunications | Secured debt                  
Line of Credit Facility [Line Items]                  
Term loan       $ 300,000,000.0          
iHeartCommunications | Subsequent Event | Revolving credit facility                  
Line of Credit Facility [Line Items]                  
Draws on credit facilities $ 25,000,000                
Repayments of line of credit         $ 59,000,000