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INVESTMENTS - Narrative (Detail)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
May 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
investment
company
Dec. 31, 2018
USD ($)
investment
company
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]          
Trade and barter revenues $ 1,072,775 $ 2,608,862   $ 3,608,529 $ 3,582,345
Number of investments made in private companies | company     11 12  
Number of investments accounted for under equity method of accounting | investment     2 2  
Number of investments accounted for under cost method | investment     1 5  
Number of investments accounted for as notes receivable convertible into equity | investment     6 5  
Purchases of investments 694 31,556   $ 20,908  
Non-cash impairment on cost investment         21,000
Impairment of investments 10,237 21,003   16,222  
iHM          
Schedule of Investments [Line Items]          
Purchases of investments       20,800  
Jelli, Inc          
Schedule of Investments [Line Items]          
Gain on sale of investments       4,400  
Trade and Barter Transactions          
Schedule of Investments [Line Items]          
Trade and barter revenues 65,934 151,497   202,674 $ 226,737
Trade and Barter Transactions | Thirteen private companies          
Schedule of Investments [Line Items]          
Trade and barter revenues $ 6,000 13,000   $ 10,800  
Audio          
Schedule of Investments [Line Items]          
Trade and barter revenues   $ 30,000