REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	May 01, 2019	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 947,920	$ 919,854	$ 1,072,775	$ 1,583,287	$ 2,582,868
Revenue from leases	418	638	696	697	2,160
Revenue, total	948,338	920,492	1,073,471	1,583,984	2,585,028
Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,899)	(1,611)	(2,568)	(3,020)	(4,884)
Revenue from leases	0	0	0	0	0
Revenue, total	(1,899)	(1,611)	(2,568)	(3,020)	(4,884)
Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	889,946	851,642	1,005,981	1,485,897	2,407,170
Revenue from leases	418	638	696	697	2,160
Revenue, total	890,364	852,280	1,006,677	1,486,594	2,409,330
Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	59,873	69,823	69,362	100,410	180,582
Revenue from leases	0	0	0	0	0
Revenue, total	59,873	69,823	69,362	100,410	180,582
Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	573,048	576,460	657,864	963,588	1,635,571
Broadcast Radio | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Broadcast Radio | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	573,048	576,460	657,864	963,588	1,635,571
Broadcast Radio | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Digital
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	96,656	72,447	102,789	160,894	200,388
Digital | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Digital | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	96,656	72,447	102,789	160,894	200,388
Digital | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	160,133	146,587	189,088	265,559	425,619
Networks | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Networks | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	160,133	146,587	189,088	265,559	425,619
Networks | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	55,541	53,191	50,330	87,331	132,339
Sponsorship and Events | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Sponsorship and Events | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	55,541	53,191	50,330	87,331	132,339
Sponsorship and Events | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	58,142	68,212	67,037	97,670	175,698
Audio and Media Services | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,731)	(1,611)	(2,325)	(2,740)	(4,884)
Audio and Media Services | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0	0
Audio and Media Services | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	59,873	69,823	69,362	100,410	180,582
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,400	2,957	5,667	8,245	13,253
Other | Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(168)	0	(243)	(280)	0
Other | Audio | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,568	2,957	5,910	8,525	13,253
Other | Audio and Media Services | Operating segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0	$ 0