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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 |  |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References No definition available. + Details
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