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REVENUE - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Deferred revenue from contracts with customers: |  |  |  |
Beginning balance | $ 149,731 | $ 178,030 | $ 145,493 | $ 162,068
Revenue recognized, included in beginning balance | (52,406) | (79,261) | (84,375) | (86,419)
Additions, net of revenue recognized during period, and other | 56,799 | 73,352 | 93,006 | 96,472
Ending balance | $ 154,124 | $ 172,121 | $ 154,124 | $ 172,121

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- Definition Change In Contract With Customer, Liability [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | ihrt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer, Liability, Additions During Period + References No definition available. + Details
Name: | ihrt_ContractWithCustomerLiabilityAdditionsDuringPeriod
Namespace Prefix: | ihrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Excluding Leases + References No definition available. + Details
Name: | ihrt_ContractWithCustomerLiabilityExcludingLeases
Namespace Prefix: | ihrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration