Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 59,550us-gaap_Revenues	$ 52,656us-gaap_Revenues
Cost of revenue - digital media	1,360us-gaap_CostOfRevenue
Direct operating expenses (including related parties of $2,167 and $2,292) (including non-cash stock-based compensation of $358 and $90)	26,685us-gaap_DirectOperatingCosts	24,876us-gaap_DirectOperatingCosts
Selling, general and administrative expenses	10,501	8,631
Depreciation and amortization (includes direct operating of $2,563 and $2,471; selling, general and administrative of $1,059 and $862 and corporate of $340 and $182) (including related parties of $581 and $581)	3,962us-gaap_DepreciationAndAmortization	3,515us-gaap_DepreciationAndAmortization
Operating income (loss)	12,049us-gaap_OperatingIncomeLoss	10,798us-gaap_OperatingIncomeLoss
Corporate expenses	4,993evc_CorporateExpenses	4,836evc_CorporateExpenses
Interest expense	(3,227)us-gaap_InterestExpense	(3,438)us-gaap_InterestExpense
Interest income	8us-gaap_InvestmentIncomeInterest	12us-gaap_InvestmentIncomeInterest
Income (loss) before income taxes	8,830	7,372
Capital expenditures	3,242evc_CapitalExpenditures	1,834evc_CapitalExpenditures
Total assets	527,624us-gaap_Assets		527,767us-gaap_Assets
Percentage change in net revenue	13.00%evc_PercentageChangeInNetRevenue
Percentage change in direct operating expenses	7.00%
Percentage change in selling, general and administrative expenses	22.00%
Percentage change in depreciation and amortization	13.00%
Percentage change in segment operating profit (loss)	9.00%
Percentage change in Corporate expenses	3.00%evc_PercentageChangeInExpenses
Percentage change in operating income (loss)	12.00%
Percentage change in interest expenses	(6.00%)evc_PercentageChangeInInterestExpense
Percentage change in interest income	(33.00%)evc_PercentageChangeInInterestIncome
Percentage change in income (loss) before income taxes	20.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	17,042	15,634
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	4,993	4,836
Television
Segment Reporting Information [Line Items]
Net revenue	39,502	37,741
Direct operating expenses (including related parties of $2,167 and $2,292) (including non-cash stock-based compensation of $358 and $90)	14,679	14,956
Selling, general and administrative expenses	5,055	4,495
Depreciation and amortization (includes direct operating of $2,563 and $2,471; selling, general and administrative of $1,059 and $862 and corporate of $340 and $182) (including related parties of $581 and $581)	2,795	2,715
Capital expenditures	2,071	911
Total assets	382,134		380,775
Percentage change in net revenue	5.00%
Percentage change in direct operating expenses	(2.00%)
Percentage change in selling, general and administrative expenses	12.00%
Percentage change in depreciation and amortization	3.00%
Percentage change in segment operating profit (loss)	9.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	16,973	15,575
Radio
Segment Reporting Information [Line Items]
Net revenue	16,345	14,915
Direct operating expenses (including related parties of $2,167 and $2,292) (including non-cash stock-based compensation of $358 and $90)	10,186	9,920
Selling, general and administrative expenses	4,526	4,136
Depreciation and amortization (includes direct operating of $2,563 and $2,471; selling, general and administrative of $1,059 and $862 and corporate of $340 and $182) (including related parties of $581 and $581)	869	800
Capital expenditures	1,153	923
Total assets	123,702		124,050
Percentage change in net revenue	10.00%
Percentage change in direct operating expenses	3.00%
Percentage change in selling, general and administrative expenses	9.00%
Percentage change in depreciation and amortization	9.00%
Percentage change in segment operating profit (loss)	1195.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	764	59
Digital
Segment Reporting Information [Line Items]
Net revenue	3,703
Cost of revenue - digital media	1,360
Direct operating expenses (including related parties of $2,167 and $2,292) (including non-cash stock-based compensation of $358 and $90)	1,820
Selling, general and administrative expenses	920
Depreciation and amortization (includes direct operating of $2,563 and $2,471; selling, general and administrative of $1,059 and $862 and corporate of $340 and $182) (including related parties of $581 and $581)	298
Capital expenditures	18
Total assets	21,788		22,942
Percentage change in net revenue	100.00%
Percentage change in Cost of revenue	100.00%
Percentage change in direct operating expenses	100.00%
Percentage change in selling, general and administrative expenses	100.00%
Percentage change in depreciation and amortization	100.00%
Percentage change in segment operating profit (loss)	100.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (695)

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