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, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Trade and barter revenues										$ 1,072,775	$ 2,608,862	$ 3,608,529	$ 3,582,345
Revenue from leases										696	1,194	2,794	4,302
Revenue, total	$ 277,674	$ 635,646	$ 1,026,072	$ 948,338	$ 795,797	$ 1,026,295	$ 920,492	$ 891,764	$ 772,772	1,073,471	2,610,056	3,611,323	3,586,647
Broadcast Radio
Disaggregation of Revenue [Line Items]
Trade and barter revenues										657,864	1,575,382	2,264,058	2,292,116
Digital
Disaggregation of Revenue [Line Items]
Trade and barter revenues										102,789	273,389	284,565	248,736
Networks
Disaggregation of Revenue [Line Items]
Trade and barter revenues										189,088	425,631	582,302	581,733
Sponsorship and Events
Disaggregation of Revenue [Line Items]
Trade and barter revenues										50,330	159,187	200,605	201,775
Audio and Media Services
Disaggregation of Revenue [Line Items]
Trade and barter revenues										67,037	162,703	257,553	229,440
Other
Disaggregation of Revenue [Line Items]
Trade and barter revenues										5,667	12,570	19,446	28,545
Audio
Disaggregation of Revenue [Line Items]
Trade and barter revenues											30,000
Operating Segments | Audio
Disaggregation of Revenue [Line Items]
Trade and barter revenues										1,005,981	2,446,606	3,350,976	3,352,905
Revenue from leases										696	1,194	2,794	4,302
Revenue, total										1,006,677	2,447,800	3,353,770	3,357,207
Operating Segments | Audio | Broadcast Radio
Disaggregation of Revenue [Line Items]
Trade and barter revenues										657,864	1,575,382	2,264,058	2,292,116
Operating Segments | Audio | Digital
Disaggregation of Revenue [Line Items]
Trade and barter revenues										102,789	273,389	284,565	248,736
Operating Segments | Audio | Networks
Disaggregation of Revenue [Line Items]
Trade and barter revenues										189,088	425,631	582,302	581,733
Operating Segments | Audio | Sponsorship and Events
Disaggregation of Revenue [Line Items]
Trade and barter revenues										50,330	159,187	200,605	201,775
Operating Segments | Audio | Audio and Media Services
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Operating Segments | Audio | Other
Disaggregation of Revenue [Line Items]
Trade and barter revenues										5,910	13,017	19,446	28,545
Operating Segments | Audio and Media Services
Disaggregation of Revenue [Line Items]
Trade and barter revenues										69,362	167,292	264,061	235,951
Revenue from leases										0	0	0	0
Revenue, total										69,362	167,292	264,061	235,951
Operating Segments | Audio and Media Services | Broadcast Radio
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Operating Segments | Audio and Media Services | Digital
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Operating Segments | Audio and Media Services | Networks
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Operating Segments | Audio and Media Services | Sponsorship and Events
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Operating Segments | Audio and Media Services | Audio and Media Services
Disaggregation of Revenue [Line Items]
Trade and barter revenues										69,362	167,292	264,061	235,951
Operating Segments | Audio and Media Services | Other
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Trade and barter revenues										(2,568)	(5,036)	(6,508)	(6,511)
Revenue from leases										0	0	0	0
Revenue, total										(2,568)	(5,036)	(6,508)	(6,511)
Consolidation, Eliminations | Broadcast Radio
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Consolidation, Eliminations | Digital
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Consolidation, Eliminations | Networks
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Consolidation, Eliminations | Sponsorship and Events
Disaggregation of Revenue [Line Items]
Trade and barter revenues										0	0	0	0
Consolidation, Eliminations | Audio and Media Services
Disaggregation of Revenue [Line Items]
Trade and barter revenues										(2,325)	(4,589)	(6,508)	(6,511)
Consolidation, Eliminations | Other
Disaggregation of Revenue [Line Items]
Trade and barter revenues										$ (243)	$ (447)	$ 0	$ 0