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INVESTMENTS - Narrative (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
investment
company
Dec. 31, 2017
USD ($)
investment
company
Dec. 31, 2016
USD ($)
Schedule of Investments [Line Items]      
Investments made in private equity companies in exchange for advertising services $ 23,358 $ 35,523  
Number of investments made in private companies | company 12 13  
Number of investments accounted for under equity method of accounting | investment 1 2  
Number of investments accounted for under cost method | investment 6 6  
Number of investments accounted for as notes receivable convertible into equity | investment 5 5  
Non-cash impairment on cost investment     $ 11,900
Marketable equity securities held $ 900 $ 1,500  
Thirteen private companies      
Schedule of Investments [Line Items]      
Barter revenue recognized 10,800 35,200  
Jelli, Inc      
Schedule of Investments [Line Items]      
Gain on Sale of Investments 4,400    
iHM | Seven private companies      
Schedule of Investments [Line Items]      
Investments made in private equity companies in exchange for advertising services $ 20,800    
iHM | Thirteen private companies      
Schedule of Investments [Line Items]      
Investments made in private equity companies in exchange for advertising services   $ 34,700