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INVESTMENTS - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2017 | May 27, 2015 | Sep. 30, 2018 | Feb. 14, 2017 | Jan. 31, 2017 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2017 | Feb. 01, 2017 | Jan. 03, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of investments |  |  |  |  |  |  | $ 8,600 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment |  | $ 1,405 |  | $ 73,902 |  |  |  |  |  | $ 0 |  | $ 1,405 | $ 0 | $ 1,405 | $ 73,902 |  | $ 82,966 |  |
Total gains (losses) included in earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1,405) | (72,497) | (9,064) |  |  |  |
Impairments of investments |  |  |  |  |  |  |  |  |  |  |  |  | 6,684 | 9,961 | 10,156 |  |  |  |
Unrealized gain |  |  |  |  |  |  |  |  |  |  |  | 51,400 |  | 51,397 |  |  |  |  |
Percentage of equity interest sold in other equity method investments |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  |  |  | $ 34,000 |  |  |  |  |  |  |  |  |
Impairment on other equity method investments |  |  |  |  |  |  |  |  |  |  |  |  | 6,700 |  | 4,600 |  |  |  |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities - redeemable preferred shares |  | 0 |  |  |  |  |  |  |  | 0 |  | 0 | 0 | 0 |  |  |  |  |
Other Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairments of investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 | 5,600 |  |  |  |
Capital Unit, Class A | Monster LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 285,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit, Class A-1 | Monster LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair-value option investment, recapitalization Transaction, shares issued (in shares) |  |  |  |  |  |  |  | 16,609,195 |  |  |  |  |  |  |  |  |  |  |
Monster LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total outstanding partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |
Fair value of investment |  | 0 |  |  |  |  |  |  |  | 0 |  | 0 | 0 | 0 |  |  |  |  |
Total gains (losses) included in earnings |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (69,408) | (9,509) |  |  |  |
Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement, discount rate |  |  | 26.00% | 21.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monster LP | Capital Unit, Class A-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, percent ownership of voting stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57.00% |
Liquidation preference |  |  |  |  | $ 85,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monster LP | Capital Unit, Class A-1 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  | 950,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monster LP | Capital Unit, Class A-1 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  | 1,494,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
All Holders | Capital Unit, Class A-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nearbuy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment |  | $ 1,400 |  |  |  |  |  |  |  | $ 0 |  | $ 1,400 | 0 | 1,400 |  |  |  |  |
Total gains (losses) included in earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,405) | $ (3,089) | $ 445 |  |  |  |
Contributed capital |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  | $ 17,000 |  |  |
Liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000
Impairments of investments |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  |  |  |  |  |  |  |
Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement, discount rate | 30.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment on other equity method investments |  |  |  |  |  |  |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |

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