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Property, Plant And Equipment, Intangible Assets And Goodwill (Narrative) (Detail) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Amortization expense | $ 263,400,000 us-gaap_AmortizationOfIntangibleAssets | $ 289,000,000 us-gaap_AmortizationOfIntangibleAssets | $ 300,000,000 us-gaap_AmortizationOfIntangibleAssets |
Purchase price | (841,000)us-gaap_PaymentsToAcquireBusinessesGross | 97,000 us-gaap_PaymentsToAcquireBusinessesGross | 50,116,000 us-gaap_PaymentsToAcquireBusinessesGross |
Goodwill | 4,187,424,000 us-gaap_Goodwill | 4,202,187,000 us-gaap_Goodwill | 4,216,085,000 us-gaap_Goodwill | 4,202,187,000 us-gaap_Goodwill
Impairment Of Long Lived Assets Held For Use | 4,500,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |
Goodwill Impairment Loss | 10,684,000 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |
Towers Transmitters And Studio Equipment [Member] |  |  |  |
Impairment Of Long Lived Assets Held For Use |  |  |  | 1,300,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cik0001400891_TowersTransmittersAndStudioEquipmentMember
iHM [Member] |  |  |  |
Cumulative impairments |  |  | 3,500,000,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_RadioBroadcastingMember |
Americas Outdoor Advertising [Member] |  |  |  |
Goodwill | 571,932,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember | 571,932,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember | 571,932,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember | 571,932,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember
Goodwill Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember |  |  |
Cumulative impairments |  |  | 2,600,000,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember |
Americas Outdoor Advertising [Member] | Building [Member] |  |  |  |
Impairment Of Long Lived Assets Held For Use |  |  | 1,700,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_AmericasOutdoorMember |
International Outdoor Advertising [Member] |  |  |  |
Goodwill | 245,180,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember | 278,202,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember | 290,316,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember | 278,202,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember
Goodwill Impairment Loss | 10,684,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember |  |  |
Cumulative impairments |  |  | 315,900,000,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_InternationalOutdoorMember |
Other [Member] |  |  |  |
Goodwill | 117,545,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember | 117,246,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember | 117,149,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember | 117,246,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember
Goodwill Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember |  |  |
Cumulative impairments |  |  | 212,000,000,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cik0001400891_OtherGoodwillMember |
FCC licenses [Member] |  |  |  |
Impairment of intangibles | 15,700,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_RegulatoryAssetAxis = cik0001400891_FccLicensesMember | 2,000,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_RegulatoryAssetAxis = cik0001400891_FccLicensesMember |  |
Billboard permits [Member] |  |  |  |
Impairment of intangibles |  | 2,500,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_RegulatoryAssetAxis = cik0001400891_BillboardPermitsMember | 35,900,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_RegulatoryAssetAxis = cik0001400891_BillboardPermitsMember |
Permanent Easements [Member] |  |  |  |
Impairment of intangibles | 3,400,000 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_RegulatoryAssetAxis = cik0001400891_PermanentEasementsMember |  |  |
Times Square Outdoor Advertising Assets [Member] |  |  |  |
Gain (loss) on disposal |  | 12,200,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_TimesSquareOutdoorAdvertisingAssetsMember |  |
Disposal proceeds |  | 18,700,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_TimesSquareOutdoorAdvertisingAssetsMember |  |
Green Bay Radio Stations [Member] |  |  |  |
Gain (loss) on disposal |  | 500,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_GreenBayRadioStationsMember |  |
Disposal proceeds |  | 17,600,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_GreenBayRadioStationsMember |  |
International Neon Business [Member] |  |  |  |
Goodwill Impairment Loss |  | 10,700,000 us-gaap_GoodwillImpairmentLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_InternationalNeonBusinessMember |  |
Gain (loss) on disposal |  |  | 39,700,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_InternationalNeonBusinessMember |
Radio stations sold |  | 5 cik0001400891_RadioStationsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_InternationalNeonBusinessMember |  | 5 cik0001400891_RadioStationsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cik0001400891_InternationalNeonBusinessMember
WOR [Member] |  |  |  |
Purchase price |  |  | 30,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorMember |
WFNX [Member] |  |  |  |
Purchase price |  |  | 14,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cik0001400891_WfnxMember |
Aloha Station Trust, LLC [Member] |  |  |  |
Net assets | 49,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Increase in property, plant and equipment | 8,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Definite lived intangible assets | 10,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Indefinite-lived Intangible Assets | 13,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Goodwill | 17,900,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Assumed liabilities | 800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
Gain (loss) on disposal | 43,500,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_BusinessAcquisitionAxis = cik0001400891_AlohaStationTrustLlcMember |  |  |
WOR And WFNX [Member] |  |  |  |
Increase in intangible assets |  | 15,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember |  | 15,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember
Increase in property, plant and equipment |  | 5,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember |  | 5,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember
Goodwill |  | 24,700,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember |  | 24,700,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember
Assumed liabilities |  | $ 700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember |  | $ 700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = cik0001400891_WorAndWfnxMember

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