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Related-Party Transactions - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Number of Class A common stock shares converted 1evc_ConversionBetweenClassesOfCommonStockNumberOfSharesConvertedPerShare    
Period to grant television station for terms of retransmission consent agreements 6 years    
Retransmission consent agreements expiring date Dec. 31, 2014    
Accounts receivable from third parties $ 3.2evc_AccountsReceivableFromThirdPartiesUnderJointSalesAgreementWithRelatedParty $ 2.8evc_AccountsReceivableFromThirdPartiesUnderJointSalesAgreementWithRelatedParty $ 2.3evc_AccountsReceivableFromThirdPartiesUnderJointSalesAgreementWithRelatedParty
Fees paid for carriage of programming $ 0evc_CarriageCost    
Univision      
Related Party Transaction [Line Items]      
Common stock percentage held by Univision 10.00%evc_RelatedPartyEquityOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evc_UnivisionMember