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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)					1 Months Ended	3 Months Ended	4 Months Ended	8 Months Ended		12 Months Ended
	Jul. 16, 2020 USD ($)	Mar. 26, 2020 USD ($)	Mar. 13, 2020 USD ($)	May 01, 2019 USD ($)	Jul. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	May 01, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) trust segment	Dec. 31, 2018 USD ($)	Nov. 22, 2019	Aug. 07, 2019	Apr. 30, 2019 USD ($)	Jun. 14, 2018 USD ($)	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Long-term debt								$ 5,765,416,000	$ 5,765,416,000	$ 6,016,930,000
Number of operating segments | segment										2
Cash and cash equivalents								400,300,000	400,300,000	$ 720,662,000
Impairment of goodwill						$ 1,200,000,000				$ 1,224,374,000
Number of trusts of which the Company is the beneficiary | trust										2
Nonamortizable intangible assets				$ 2,195,984,000			$ 2,195,984,000
Noncash impairment charge of other investments							8,300,000	21,000,000.0		$ 900,000	$ 14,200,000
Advertising expenses							59,600,000		126,000,000.0	167,200,000	201,200,000
Advertising expense, barter costs							46,000,000.0		105,000,000.0	133,000,000.0	155,200,000
Total member's equity (deficit)				2,779,115,000			2,779,115,000	2,945,441,000	2,945,441,000	1,050,817,000	(11,560,342,000)					$ (11,344,344,000)
Credit loss reserve against available-for-sale debt securities										5,600,000
Retained Earnings (Accumulated Deficit)
Subsequent Event [Line Items]
Total member's equity (deficit)				0			0	112,548,000	112,548,000	$ (1,803,620,000)	(13,345,346,000)					$ (13,142,001,000)
Adoption of ASC 842, Leases
Subsequent Event [Line Items]
Total member's equity (deficit)											128,908,000
Adoption of ASC 842, Leases | Retained Earnings (Accumulated Deficit)
Subsequent Event [Line Items]
Total member's equity (deficit)								1,500,000	1,500,000		$ 128,908,000
International Outdoor Advertising
Subsequent Event [Line Items]
Impairment of goodwill				3,300,000,000
Other
Subsequent Event [Line Items]
Revenue, performance obligation, description of timing										The Company’s media representation contracts typically have terms up to ten years in duration and are generally billed monthly upon satisfaction of the performance obligations
Minimum | Buildings and improvements
Subsequent Event [Line Items]
Estimate useful lives										10 years
Minimum | Towers, transmitters and studio equipment
Subsequent Event [Line Items]
Estimate useful lives										5 years
Minimum | Furniture and other equipment
Subsequent Event [Line Items]
Estimate useful lives										3 years
Maximum | Buildings and improvements
Subsequent Event [Line Items]
Estimate useful lives										39 years
Maximum | Towers, transmitters and studio equipment
Subsequent Event [Line Items]
Estimate useful lives										40 years
Maximum | Furniture and other equipment
Subsequent Event [Line Items]
Estimate useful lives										7 years
Licensing Agreements
Subsequent Event [Line Items]
Non-cash impairment charge						$ 502,700,000	91,400,000
Nonamortizable intangible assets				2,281,720,000			2,281,720,000
iHeartCommunications, Inc.
Subsequent Event [Line Items]
Long-term debt				5,800,000,000			5,800,000,000							$ 16,000,000,000
Asset-based Revolving Credit Facility Due 2023
Subsequent Event [Line Items]
Repayments of lines of credit					$ 235,000,000.0
Asset-based Revolving Credit Facility Due 2023 | Subsidiaries
Subsequent Event [Line Items]
Repayments of lines of credit	$ 235,000,000.0
Term Loan B | Subsidiaries
Subsequent Event [Line Items]
Debt instrument, face amount					2,500,000,000
Line of Credit | Asset-based Revolving Credit Facility Due 2023
Subsequent Event [Line Items]
Debt instrument, face amount										$ 450,000,000.0
Maximum borrowing capacity										450,000,000.0
Outstanding borrowings under facility										0
Letters of credit outstanding										32,900,000
Borrowing base availability										417,100,000
Line of credit, amount available to be drawn										172,000,000
Line of Credit | Asset-based Revolving Credit Facility Due 2023 | Subsidiaries
Subsequent Event [Line Items]
Draws on credit facilities		$ 350,000,000.0	$ 350,000,000.0
Secured Debt
Subsequent Event [Line Items]
Long-term debt								4,322,263,000	4,322,263,000	4,600,762,000
Secured Debt | iHeartCommunications, Inc.
Subsequent Event [Line Items]
Debt instrument, face amount				3,500,000,000			3,500,000,000
Secured Debt | Subsidiaries
Subsequent Event [Line Items]
Proceeds from issuance of term loan					$ 450,000,000.0
Secured Debt | 8.375% Senior Unsecured Notes due 2027 | iHeartCommunications, Inc.
Subsequent Event [Line Items]
Debt instrument, face amount				$ 1,450,000,000			$ 1,450,000,000
Stated interest rate (as a percent)				8.375%			8.375%
Secured Debt | 6.375% Senior Secured Notes due 2026
Subsequent Event [Line Items]
Long-term debt				$ 800,000,000			$ 800,000,000	800,000,000	800,000,000	800,000,000
Debt instrument, face amount				$ 800,000,000			$ 800,000,000			$ 800,000,000.0
Stated interest rate (as a percent)				6.375%			6.375%			6.375%		6.375%	6.375%
Secured Debt | 6.375% Senior Secured Notes due 2026 | iHeartCommunications, Inc.
Subsequent Event [Line Items]
Debt instrument, face amount				$ 800,000,000			$ 800,000,000
Stated interest rate (as a percent)				6.375%			6.375%
Secured Debt | Asset-based Revolving Credit Facility Due 2023
Subsequent Event [Line Items]
Long-term debt				$ 0			$ 0	0	0	$ 0
Senior Notes | 6.375% Senior Secured Notes due 2026 | iHeartCommunications, Inc.
Subsequent Event [Line Items]
Stated interest rate (as a percent)				6.375%			6.375%
Revolving Credit Facility | Line of Credit | iHeartCommunications, Inc.
Subsequent Event [Line Items]
Maximum borrowing capacity				$ 450,000,000			$ 450,000,000
Revolving Credit Facility | Line of Credit | Asset-based Revolving Credit Facility Due 2023
Subsequent Event [Line Items]
Maximum borrowing capacity								$ 450,000,000	$ 450,000,000
Revolving Credit Facility | Line of Credit | Asset-based Revolving Credit Facility Due 2023 | Subsidiaries
Subsequent Event [Line Items]
Maximum borrowing capacity				$ 450,000,000.0			$ 450,000,000.0								$ 450,000,000.0
Borrowing base availability	$ 190,600,000

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