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INVESTMENTS - Summary of Investments (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended				12 Months Ended
	May 09, 2016	May 27, 2015	Feb. 14, 2017	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 21, 2017	Feb. 01, 2017	Jan. 03, 2017
Schedule of Equity Method Investments [Line Items]
Available-for-sale Securities				$ 0				$ 0	$ 10,340
Investments, Fair Value Disclosure				1,405				1,405	84,242
Assets, Current				887,913				887,913	998,629
Equity method investments				1,405				1,405	73,902	$ 82,966	$ 82,584	$ 400
(Gain) loss from changes in fair value of investments								(72,497)	(9,064)	382
Liabilities, Current				821,547				821,547	957,174
Liabilities, Noncurrent				44,987				44,987	100,688
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount								51,397
Disposition of Intangible Assets, Gross Consideration Received	$ 16,000
Gain (Loss) on Disposition of Business	$ 7,600
Investments (including $1,405 and $84,242 at December 31, 2019 and December 31, 2018 at fair value)				$ 76,576				$ 76,576	$ 108,515
Minimum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock				19.00%				19.00%	19.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock				25.00%				25.00%	25.00%
Capital Unit, Class A [Member] \| Monster LP
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Interest in Partnership Unit		$ 285,000
Capital Unit, Class A-1 [Member] \| Monster LP
Schedule of Equity Method Investments [Line Items]
Fair-Value Option Investment, Recapitalization Transaction, Shares Issued			16,609,195
Nearbuy
Schedule of Equity Method Investments [Line Items]
Assets, Current				$ 3,611				$ 3,611	$ 5,286
Equity method investments				1,400				1,400	4,500
Proceeds from Contributed Capital							$ 3,000				$ 17,000
Preferred Stock, Liquidation Preference, Value														$ 20,000
(Gain) loss from changes in fair value of investments				3,100				(3,089)	445	133
Equity Method Investment, Summarized Financial Information, Net Income (Loss)								(1,777)	(13,594)	15,122
Assets, Noncurrent				40,083				40,083	46,940
Liabilities, Current				4,966				4,966	4,015
Liabilities, Noncurrent				1,268				1,268	144
Gain (Loss) on Sale of Equity Investments									22,600
Monster LP
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue								569,869	416,042	280,612
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)								43,416	27,838	37,773
Equity Method Investment, Summarized Financial Information, Gain (Loss) Before Income Taxes								(105,212)	(132,276)	(124,873)
Assets, Current				73,598				73,598	85,844
Equity method investments				0				0	69,400
Fair-Value Option Investments, Recapitalization Transaction, Ownership Percentage Outstanding													9.00%
(Gain) loss from changes in fair value of investments					$ 27,900	$ 41,500		(69,408)	(9,509)	249
Equity Method Investment, Summarized Financial Information, Net Income (Loss)								(105,212)	(132,276)	$ (124,873)
Assets, Noncurrent				436,809				436,809	482,505
Liabilities, Current				430,592				430,592	432,133
Liabilities, Noncurrent				150,118				150,118	78,434
Monster LP \| Capital Unit, Class A-1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock													57.00%
Fair-Value Option Investments, Recapitalization Transaction, Liquidation Preference			$ 85,000
Monster LP \| Capital Unit, Class A-1 [Member] \| Minimum
Schedule of Equity Method Investments [Line Items]
Stock or Units Available for Distributions			950,000,000.0
Monster LP \| Capital Unit, Class A-1 [Member] \| Maximum
Schedule of Equity Method Investments [Line Items]
Stock or Units Available for Distributions			1,494,000,000.0
Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments				$ 75,171				$ 75,171	$ 24,273
Other Equity Investments \| Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock				1.00%				1.00%	1.00%
Other Equity Investments \| Maximum
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock				19.00%				19.00%	19.00%
Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments				$ 1,405				$ 1,405	$ 73,902
Fair Value Option Investments \| Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock				10.00%				10.00%	10.00%
Fair Value Option Investments \| Maximum
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock				19.00%				19.00%	19.00%
Redeemable Preferred Stock
Schedule of Equity Method Investments [Line Items]
Available-for-sale Securities				$ 0				$ 0	$ 10,340