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INVESTMENTS - Narrative (Detail) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended		20 Months Ended
	May 01, 2019 USD ($)	Dec. 31, 2019 USD ($) company investment	Dec. 31, 2020 USD ($) investment company	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
Trade and barter revenues	$ 1,072,775	$ 2,608,862	$ 2,946,124	$ 3,608,529
Number of investments made in private companies | company		10	7
Number of investments accounted for under equity method of accounting | investment		2	1
Number of investments accounted for under cost method | investment		1	2
Number of investments accounted for as notes receivable convertible into equity | investment		6	4
Number of investments accounted for as available for sale securities | investment			1
Impairment of investments	10,200		$ 5,700		$ 21,000
Trade and Barter Transactions
Schedule of Investments [Line Items]
Trade and barter revenues	65,934	$ 151,497	158,383	$ 202,674
Trade and Barter Transactions | Investments as services
Schedule of Investments [Line Items]
Trade and barter revenues	$ 6,000	13,000	10,500
Audio
Schedule of Investments [Line Items]
Trade and barter revenues		$ 30,000	$ 15,000

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