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Segment Data - Separate Financial Data for Each of Company's Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Net revenue $ 65,262us-gaap_Revenues $ 62,274us-gaap_Revenues $ 61,846us-gaap_Revenues $ 52,656us-gaap_Revenues $ 60,093us-gaap_Revenues $ 57,786us-gaap_Revenues $ 56,950us-gaap_Revenues $ 49,087us-gaap_Revenues $ 242,038us-gaap_Revenues $ 223,916us-gaap_Revenues $ 223,253us-gaap_Revenues
Cost of revenue                 2,993us-gaap_CostOfRevenue    
Direct operating expenses                 107,281us-gaap_DirectOperatingCosts 103,686us-gaap_DirectOperatingCosts 92,256us-gaap_DirectOperatingCosts
Selling, general and administrative expenses                 35,399us-gaap_SellingGeneralAndAdministrativeExpense 31,556us-gaap_SellingGeneralAndAdministrativeExpense 37,818us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization                 14,663us-gaap_DepreciationAndAmortization 14,953us-gaap_DepreciationAndAmortization 16,426us-gaap_DepreciationAndAmortization
Segment operating profit (loss)                 81,702evc_SegmentOperatingProfitLoss 73,721evc_SegmentOperatingProfitLoss 76,753evc_SegmentOperatingProfitLoss
Corporate expenses                 21,301evc_CorporateExpenses 19,771evc_CorporateExpenses 17,976evc_CorporateExpenses
Impairment charge                 735us-gaap_AssetImpairmentCharges    
Operating income (loss)                 59,666us-gaap_OperatingIncomeLoss 53,950us-gaap_OperatingIncomeLoss 58,777us-gaap_OperatingIncomeLoss
Capital expenditures                 9,111evc_CapitalExpenditures 9,748evc_CapitalExpenditures 9,900evc_CapitalExpenditures
Total assets 527,767us-gaap_Assets       538,237us-gaap_Assets       527,767us-gaap_Assets 538,237us-gaap_Assets 438,051us-gaap_Assets
Percentage change in net revenue                 8.00%evc_PercentageChangeInNetRevenue 0.00%evc_PercentageChangeInNetRevenue  
Percentage change in direct operating expenses                 3.00%evc_PercentageChangeInDirectOperatingCosts 12.00%evc_PercentageChangeInDirectOperatingCosts  
Percentage change in selling, general and administrative expenses                 12.00%evc_PercentageChangeInSellingGeneralAndAdministrativeExpense (17.00%)evc_PercentageChangeInSellingGeneralAndAdministrativeExpense  
Percentage change in depreciation and amortization                 (2.00%)evc_PercentageChangeInDepreciationAndAmortization (9.00%)evc_PercentageChangeInDepreciationAndAmortization  
Percentage change in segment operating profit (loss)                 11.00%evc_PercentageChangeInOperatingProfitLoss (4.00%)evc_PercentageChangeInOperatingProfitLoss  
Percentage change in Corporate expenses                 8.00%evc_PercentageChangeInExpenses 10.00%evc_PercentageChangeInExpenses  
Percentage change in impairment charge                 100.00%evc_PercentageChangeInImpairmentCharge 0.00%evc_PercentageChangeInImpairmentCharge  
Percentage change in operating income (loss)                 11.00%evc_PercentageChangeInOperatingIncomeLoss (8.00%)evc_PercentageChangeInOperatingIncomeLoss  
Television                      
Segment Reporting Information [Line Items]                      
Net revenue                 165,472us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 156,994us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 156,839us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Direct operating expenses                 63,569us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 63,623us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 56,664us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Selling, general and administrative expenses                 17,278us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 15,797us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 20,571us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Depreciation and amortization                 10,680us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 12,084us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 13,312us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Segment operating profit (loss)                 73,945evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 65,490evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 66,292evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Capital expenditures                 6,084evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 7,243evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 8,339evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Total assets 380,775us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		       412,487us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		       380,775us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 412,487us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 313,904us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember
Percentage change in net revenue                 5.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 0.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		  
Percentage change in direct operating expenses                 0.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 12.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		  
Percentage change in selling, general and administrative expenses                 9.00%evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 (23.00%)evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		  
Percentage change in depreciation and amortization                 (12.00%)evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 (9.00%)evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		  
Percentage change in segment operating profit (loss)                 13.00%evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		 (1.00%)evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_TelevisionMember		  
Radio                      
Segment Reporting Information [Line Items]                      
Net revenue                 69,922us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 66,922us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 66,414us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Direct operating expenses                 41,349us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 40,063us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 35,592us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Selling, general and administrative expenses                 16,773us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 15,759us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 17,247us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Depreciation and amortization                 3,391us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 2,869us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 3,114us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Segment operating profit (loss)                 8,409evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 8,231evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 10,461evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Capital expenditures                 2,995evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 2,505evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 1,561evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Total assets 124,050us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		       125,750us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		       124,050us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 125,750us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 124,147us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember
Percentage change in net revenue                 4.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 1.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		  
Percentage change in direct operating expenses                 3.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 13.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		  
Percentage change in selling, general and administrative expenses                 6.00%evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 (9.00%)evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		  
Percentage change in depreciation and amortization                 18.00%evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 (8.00%)evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		  
Percentage change in segment operating profit (loss)                 2.00%evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		 (21.00%)evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_RadioMember		  
Digital                      
Segment Reporting Information [Line Items]                      
Net revenue                 6,644us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Cost of revenue                 2,993us-gaap_CostOfRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Direct operating expenses                 2,363us-gaap_DirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Selling, general and administrative expenses                 1,348us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Depreciation and amortization                 592us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Segment operating profit (loss)                 (652)evc_SegmentOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Capital expenditures                 32evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0evc_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember
Total assets $ 22,942us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		               $ 22,942us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		    
Percentage change in net revenue                 100.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInNetRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		  
Percentage change in Cost of revenue                 100.00%evc_PercentageChangeInCostOfRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInCostOfRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		  
Percentage change in direct operating expenses                 100.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInDirectOperatingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		  
Percentage change in selling, general and administrative expenses                 100.00%evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInSellingGeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		  
Percentage change in depreciation and amortization                 100.00%evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		  
Percentage change in segment operating profit (loss)                 100.00%evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember		 0.00%evc_PercentageChangeInOperatingProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= evc_DigitalMediaMember