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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Operating Leased Assets [Line Items] |  |  |
Adoption of ASC 842,leases |  |  | $ 128,908
Right-of-use asset, amortization of gain (loss) | $ 5,300 | $ 5,300 |
Retained Earnings |  |  |
Operating Leased Assets [Line Items] |  |  |
Adoption of ASC 842,leases |  |  | $ 128,908

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- Definition Lessee, Operating Lease, Right-of-Use Asset, Amortization of Gain (Loss) + References No definition available. + Details
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Namespace Prefix: | ihrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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