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Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Balance	$ 4,187,424us-gaap_Goodwill	$ 4,202,187us-gaap_Goodwill
Impairment		0us-gaap_GoodwillImpairmentLoss
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod	18,199us-gaap_GoodwillAcquiredDuringPeriod
Dispositions	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Foreign currency	(16,792)us-gaap_GoodwillTranslationAdjustments	(33,022)us-gaap_GoodwillTranslationAdjustments
Other	0us-gaap_GoodwillOtherChanges	60us-gaap_GoodwillOtherChanges
Balance	4,170,632us-gaap_Goodwill	4,187,424us-gaap_Goodwill
iHM [Member]
Goodwill [Line Items]
Balance	3,252,767us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	3,234,807us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Impairment		0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	17,900us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Dispositions	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Foreign currency	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Other	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	60us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Balance	3,252,767us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember	3,252,767us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioMember
Americas Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	584,574us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	585,227us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Impairment		0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Dispositions	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Foreign currency	(167)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	(653)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Other	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Balance	584,407us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember	584,574us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
International Outdoor Advertising [Member]
Goodwill [Line Items]
Balance	232,538us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	264,907us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Impairment		0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Dispositions	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Foreign currency	(16,625)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	(32,369)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Other	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Balance	215,913us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember	232,538us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Other [Member]
Goodwill [Line Items]
Balance	117,545us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	117,246us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Impairment		0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	299us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Dispositions	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Foreign currency	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Other	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	0us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Balance	$ 117,545us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember	$ 117,545us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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