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LONG-TERM DEBT - Surety Bonds, Letters of Credit and Guarantees - Narrative (Detail) $ in Millions	Jun. 30, 2018 USD ($)
Surety bonds
Guarantor Obligations [Line Items]
Guarantees obligations	$ 71.0
Commercial standby letters of credit
Guarantor Obligations [Line Items]
Guarantees obligations	166.8
Bank guarantees
Guarantor Obligations [Line Items]
Guarantees obligations	38.5
Bank guarantees backed by cash collateral
Guarantor Obligations [Line Items]
Guarantees obligations	17.6
Letters of credit backed by cash collateral
Guarantor Obligations [Line Items]
Guarantees obligations	$ 26.0

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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_GuaranteeObligationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=ihrt_BankGuaranteesCollaterizedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=ihrt_LettersOfCreditCollateralizedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: