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LONG-TERM DEBT - Prepayments (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017
Scenario A |
Line of Credit Facility [Line Items] |
Prepayment made before first anniversary, percent | 2.00%
Prepayment made on and after first anniversary and prior to second anniversary, percent | 1.00%
Scenario B |
Line of Credit Facility [Line Items] |
Prepayment made before first anniversary, percent | 1.00%
Prepayment made on and after first anniversary and prior to second anniversary, percent | 0.50%

X
- Definition Debt Instrument, Prepayment Terms, Premium Paid, On Or After First Anniversary Of Closing Date And Prior To Second Anniversary, Percentage + References No definition available. + Details
Name: | ihrt_DebtInstrumentPrepaymentTermsPremiumPaidOnOrAfterFirstAnniversaryOfClosingDateAndPriorToSecondAnniversaryPercentage
Namespace Prefix: | ihrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Prepayment Terms, Premium Paid, On Or After First Anniversary Of Closing Date, Percentage + References No definition available. + Details
Name: | ihrt_DebtInstrumentPrepaymentTermsPremiumPaidOnOrAfterFirstAnniversaryOfClosingDatePercentage
Namespace Prefix: | ihrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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: | ihrt_DebtCovenantPrepaymentPeriodAxis=ihrt_ScenarioAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ihrt_DebtCovenantPrepaymentPeriodAxis=ihrt_ScenarioBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |