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GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS: (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]              
Indefinite-Lived License Agreements $ 666,797,000us-gaap_IndefiniteLivedLicenseAgreements $ 659,824,000us-gaap_IndefiniteLivedLicenseAgreements          
Amortization Of Intangible Assets 27,100,000us-gaap_AmortizationOfIntangibleAssets 27,700,000us-gaap_AmortizationOfIntangibleAssets 28,400,000us-gaap_AmortizationOfIntangibleAssets        
Deferred Finance Costs, Net 4,600,000us-gaap_DeferredFinanceCostsNet 5,300,000us-gaap_DeferredFinanceCostsNet 4,500,000us-gaap_DeferredFinanceCostsNet        
Impairment Testing [Member]              
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]              
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_ImpairmentTestingMember
14,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_ImpairmentTestingMember
313,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_ImpairmentTestingMember
       
2013 Interim Impairment Testing [Member]              
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]              
Pre Tax Impairment Charges       3,700,000roia_PreTaxImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_TwoThousandThirteenInterimImpairmentTestingMember
9,800,000roia_PreTaxImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_TwoThousandThirteenInterimImpairmentTestingMember
1,400,000roia_PreTaxImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_TwoThousandThirteenInterimImpairmentTestingMember
 
2012 Interim Impairment Testing [Member]              
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]              
Pre Tax Impairment Charges             $ 313,000roia_PreTaxImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= roia_TwoThousandTweleveInterimImpairmentTestingMember