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INVESTMENTS - Narrative (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
investment
Dec. 31, 2016
USD ($)
company
investment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Investments [Line Items]        
Investments made in private equity companies in exchange for advertising services   $ 32,823 $ 65,526  
Number of investments made in private companies 3 4    
Number of investments accounted for under equity method of accounting | investment 1 2    
Number of investments accounted for under cost method | investment 2 2    
Barter revenue recognized   $ 165,800 133,500 $ 78,300
Non-cash impairment on cost investment   14,500 5,000  
Non-cash impairment on equity investment   15,000    
Marketable equity securities held $ 2,300 1,700 $ 2,300  
Three private companies        
Schedule of Investments [Line Items]        
Barter revenue recognized 15,600 36,600    
iHM | Four private companies        
Schedule of Investments [Line Items]        
Investments made in private equity companies in exchange for advertising services   $ 26,100    
iHM | Three private companies        
Schedule of Investments [Line Items]        
Investments made in private equity companies in exchange for advertising services $ 36,500