REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							4 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2019	Jun. 30, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	May 01, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues										$ 1,072,775	$ 2,608,862	$ 2,946,124	$ 3,608,529
Revenue from leases										696	1,194	2,094	2,794
Revenue, total	$ 277,674	$ 635,646	$ 935,530	$ 744,406	$ 487,648	$ 780,634	$ 1,026,072	$ 948,338	$ 795,797	1,073,471	2,610,056	2,948,218	3,611,323
Broadcast Radio
Disaggregation of Revenue [Line Items]
Revenues										657,864	1,575,382	1,604,880	2,264,058
Digital
Disaggregation of Revenue [Line Items]
Revenues										102,789	273,389	474,371	284,565
Networks
Disaggregation of Revenue [Line Items]
Revenues										189,088	425,631	484,950	582,302
Sponsorship and Events
Disaggregation of Revenue [Line Items]
Revenues										50,330	159,187	107,654	200,605
Audio and Media Services
Disaggregation of Revenue [Line Items]
Revenues										67,037	162,703	267,663	257,553
Other
Disaggregation of Revenue [Line Items]
Revenues										5,667	12,570	6,606	19,446
Audio
Disaggregation of Revenue [Line Items]
Revenues											30,000	15,000
Operating Segments \| Audio
Disaggregation of Revenue [Line Items]
Revenues										1,005,981	2,446,606	2,679,131	3,350,976
Revenue from leases										696	1,194	2,094	2,794
Revenue, total										1,006,677	2,447,800	2,681,225	3,353,770
Operating Segments \| Audio \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Revenues										657,864	1,575,382	1,604,880	2,264,058
Operating Segments \| Audio \| Digital
Disaggregation of Revenue [Line Items]
Revenues										102,789	273,389	474,371	284,565
Operating Segments \| Audio \| Networks
Disaggregation of Revenue [Line Items]
Revenues										189,088	425,631	484,950	582,302
Operating Segments \| Audio \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Revenues										50,330	159,187	107,654	200,605
Operating Segments \| Audio \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Operating Segments \| Audio \| Other
Disaggregation of Revenue [Line Items]
Revenues										5,910	13,017	7,276	19,446
Operating Segments \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Revenues										69,362	167,292	274,749	264,061
Revenue from leases										0	0	0	0
Revenue, total										69,362	167,292	274,749	264,061
Operating Segments \| Audio and Media Services \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Operating Segments \| Audio and Media Services \| Digital
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Operating Segments \| Audio and Media Services \| Networks
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Operating Segments \| Audio and Media Services \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Operating Segments \| Audio and Media Services \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Revenues										69,362	167,292	274,749	264,061
Operating Segments \| Audio and Media Services \| Other
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues										(2,568)	(5,036)	(7,756)	(6,508)
Revenue from leases										0	0	0	0
Revenue, total										(2,568)	(5,036)	(7,756)	(6,508)
Consolidation, Eliminations \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Consolidation, Eliminations \| Digital
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Consolidation, Eliminations \| Networks
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Consolidation, Eliminations \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Revenues										0	0	0	0
Consolidation, Eliminations \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Revenues										(2,325)	(4,589)	(7,086)	(6,508)
Consolidation, Eliminations \| Other
Disaggregation of Revenue [Line Items]
Revenues										$ (243)	$ (447)	$ (670)	$ 0