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LONG-TERM DEBT - Collateral and Guarantees (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Senior secured credit facilities |
Line of Credit Facility [Line Items] |
Capital stock used to secure obligations under senior secured credit facilities (as a percent) | 100.00%

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- Definition Line Of Credit Facility, Collateral, Percent Of Capital Stock + References No definition available. + Details
Name: | ihrt_LineOfCreditFacilityCollateralPercentOfCapitalStock
Namespace Prefix: | ihrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |