Debt instrument additional borrowings capacity.

No definition available.

Name:	evc_DebtInstrumentAdditionalBorrowingsCapacity
Namespace Prefix:	evc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Default period for compliance with other agreement.

+ References

No definition available.

+ Details

Name:	evc_DefaultPeriodForComplianceWithOtherAgreement
Namespace Prefix:	evc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Failure in payment of final judgments minimum aggregate amount.

+ References

No definition available.

+ Details

Name:	evc_FailureInPaymentOfFinalJudgmentsMinimumAggregateAmount
Namespace Prefix:	evc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Failure in payment of final judgments minimum aggregate amount period.

+ References

No definition available.

+ Details

Name:	evc_FailureInPaymentOfFinalJudgmentsMinimumAggregateAmountPeriod
Namespace Prefix:	evc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

First lien net leverage ratio.

+ References

No definition available.

+ Details

Name:	evc_FirstLienNetLeverageRatio
Namespace Prefix:	evc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility, agreement date.

+ References

No definition available.

+ Details

Name:	evc_LineOfCreditFacilityAgreementDate
Namespace Prefix:	evc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility minimum aggregate indebtedness amount.

+ References

No definition available.

+ Details

Name:	evc_LineOfCreditFacilityMinimumAggregateIndebtednessAmount
Namespace Prefix:	evc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of credit facility prepayment.

+ References

No definition available.

+ Details

Name:	evc_LineOfCreditFacilityPrepayment
Namespace Prefix:	evc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period to default in payment of financial statement delivery obligations.

+ References

No definition available.

+ Details

Name:	evc_PeriodToDefaultInPaymentOfFinancialStatementDeliveryObligations
Namespace Prefix:	evc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period to default in payment of interest on borrowings.

+ References

No definition available.

+ Details

Name:	evc_PeriodToDefaultInPaymentOfInterestOnBorrowings
Namespace Prefix:	evc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=evc_TwoThousandSeventeenRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=evc_SeniorSecuredTermLoanBFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - 2017 Credit Facility - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 2,226,000	$ 1,796,000
2017 Credit Facility
Debt Instrument [Line Items]
Agreement date	Nov. 30, 2017
Additional borrowing capacity	$ 100,000,000.0
First lien net leverage ratio	4.00%
Certain customary events of default, number of business days to default in the payment of interest on borrowings			3 days
Certain customary events of default, number of days default continue for compliance with other agreement			30 days
Certain customary events of default, number of days default continue for financial statement delivery obligations			10 days
Certain customary events of default, indebtedness aggregate amount			$ 15,000,000.0
Certain customary events of default, failure in payment of final judgments aggregate amount			$ 15,000,000.0
Certain customary events of default, failure in payment of final judgments aggregate amount period			30 days
2017 Credit Facility \| Eurodollar Rate
Debt Instrument [Line Items]
Variable interest rate basis spread on debt	2.75%
2017 Credit Facility \| Base Rate Margin
Debt Instrument [Line Items]
Variable interest rate basis spread on debt	1.75%
2017 Credit Facility \| Term Loan B Facility
Debt Instrument [Line Items]
Senior Secured debt	$ 300,000,000.0
Maturity date of revolving credit facility	Nov. 30, 2024
Interest rate on term loan			2.90%
Prepayments to reduce loans outstanding		$ 25,000,000.0	$ 0
Carrying value of term loan			213,500,000
Unamortized debt issuance costs			1,800,000
Estimated fair value of term loan			$ 210,500,000