INTANGIBLE ASSETS AND GOODWILL - Narrative (Details)	3 Months Ended					12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) radioMarket	Dec. 31, 2021 USD ($) year	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) radioMarket	Nov. 17, 2017 radioMarket	Nov. 16, 2017 radioMarket
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment testing window						3 years
Impairment charge on licenses						$ 0	$ 261,929,000
Goodwill impairment loss					$ 537,400,000	$ 0	0	$ 537,353,000
Income model years | year						10
Number of radio markets | radioMarket					47			47	48	28
Goodwill impairment loss, net of tax					$ 519,600,000
Goodwill	$ 82,176,000	$ 62,215,000			43,920,000	$ 82,176,000	62,215,000	$ 43,920,000
Radio broadcasting licenses
Finite-Lived Intangible Assets [Line Items]
Impairment charge on licenses	0	246,000,000	$ 11,800,000	$ 4,100,000	0
Impairment charge on licenses, net of tax		$ 180,400,000	$ 8,700,000	$ 3,000,000
Podcasting Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment loss	0						$ 0
QLGG Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment loss	$ 0
Broadcast Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 0			$ 0