REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 953,640	$ 861,260	$ 1,796,808	$ 1,567,441
Revenue from leases	365	345	655	829
Revenue, total	954,005	861,605	1,797,463	1,568,270
Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	463,304	451,142	879,785	809,678
Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	127,532	123,586	245,090	238,672
Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	38,064	28,585	71,665	50,978
Digital, excluding Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	165,504	143,324	309,910	260,631
Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85,681	53,428	154,225	91,780
Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	69,687	59,171	129,203	112,447
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,868	2,024	6,930	3,255
Operating segments \| Multiplatform Group
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	632,935	605,505	1,203,805	1,102,918
Revenue from leases	365	345	655	829
Revenue, total	633,300	605,850	1,204,460	1,103,747
Operating segments \| Multiplatform Group \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	463,304	451,142	879,785	809,678
Operating segments \| Multiplatform Group \| Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	127,532	123,586	245,090	238,672
Operating segments \| Multiplatform Group \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	38,064	28,585	71,665	50,978
Operating segments \| Multiplatform Group \| Digital, excluding Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Multiplatform Group \| Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Multiplatform Group \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Multiplatform Group \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,035	2,192	7,265	3,590
Operating segments \| Digital Audio Group
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	252,561	197,930	466,780	355,483
Revenue from leases	0	0	0	0
Revenue, total	252,561	197,930	466,780	355,483
Operating segments \| Digital Audio Group \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Digital Audio Group \| Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		0	0	0
Operating segments \| Digital Audio Group \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Digital Audio Group \| Digital, excluding Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	166,880	144,502	312,555	263,703
Operating segments \| Digital Audio Group \| Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85,681	53,428	154,225	91,780
Operating segments \| Digital Audio Group \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Digital Audio Group \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	71,065	61,175	131,922	116,312
Revenue from leases	0	0	0	0
Revenue, total	71,065	61,175	131,922	116,312
Operating segments \| Audio & Media Services Group \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group \| Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group \| Digital, excluding Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group \| Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating segments \| Audio & Media Services Group \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	71,065	61,175	131,922	116,312
Operating segments \| Audio & Media Services Group \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Eliminations
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(2,921)	(3,350)	(5,699)	(7,272)
Revenue from leases	0	0	0	0
Revenue, total	(2,921)	(3,350)	(5,699)	(7,272)
Eliminations \| Broadcast Radio
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Eliminations \| Networks
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Eliminations \| Sponsorship and Events
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Eliminations \| Digital, excluding Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,376)	(1,178)	(2,645)	(3,072)
Eliminations \| Podcast
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Eliminations \| Audio and Media Services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,378)	(2,004)	(2,719)	(3,865)
Eliminations \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ (167)	$ (168)	$ (335)	$ (335)