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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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