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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 |

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