v3.20.2

SHAREHOLDERS' EQUITY - Shareholder Rights Agreement (Details) | Apr. 20, 2020 right $ / shares shares
--- | ---
Class of Stock [Line Items] |
Multiple of current purchase price per right | 2
Class A Right |
Class of Stock [Line Items] |
Number stock purchase rights | right | 1
Number of shares per right (in shares) | shares | 0.001
Purchase price (in dollars per share) | $ / shares | $ 6.06
Exchange rate (in shares) | shares | 0.001
Class B Right |
Class of Stock [Line Items] |
Number stock purchase rights | right | 1
Number of shares per right (in shares) | shares | 0.001
Purchase price (in dollars per share) | $ / shares | $ 6.06
Exchange rate (in shares) | shares | 0.001
Common Class A |
Class of Stock [Line Items] |
Par Value (in dollars per share) | $ / shares | $ 0.01
Assets or earning power sold (in percent) | 50.00%
Threshold of common stock owned by acquired person (in percent) | 50.00%
Ownership threshold | 10.00%
Percentage of common stock acquired that will cause diluted (in percent) | 10.00%
Percentage of common stock acquired by passive institutional investors that will cause dilution (in percent) | 15.00%
Common Class B |
Class of Stock [Line Items] |
Par Value (in dollars per share) | $ / shares | $ 0.01

X
- Definition Assets Or Earning Power Sold, Percent + References No definition available. + Details
Name: | etm_AssetsOrEarningPowerSoldPercent
Namespace Prefix: | etm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class Of Warrant Or Right, Exchange Rate + References No definition available. + Details
Name: | etm_ClassOfWarrantOrRightExchangeRate
Namespace Prefix: | etm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class of Warrant or Right, Exercise Price of Warrants or Rights, Per One One Thousandth Of a Share + References No definition available. + Details
Name: | etm_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsPerOneOneThousandthOfAShare
Namespace Prefix: | etm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class of Warrant or Right, Qualifying Offer, Ownership Threshold + References No definition available. + Details
Name: | etm_ClassOfWarrantOrRightQualifyingOfferOwnershipThreshold
Namespace Prefix: | etm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Multiple Of Current Purchase Price of One Right + References No definition available. + Details
Name: | etm_MultipleOfCurrentPurchasePriceOfOneRight
Namespace Prefix: | etm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Stock Purchase Rights + References No definition available. + Details
Name: | etm_NumberStockPurchaseRights
Namespace Prefix: | etm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Common Stock Acquired That Will Cause Dilution + References No definition available. + Details
Name: | etm_PercentageOfCommonStockAcquiredThatWillCauseDilution
Namespace Prefix: | etm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Common Stock Acquired That Will Cause Dilution, Passive Institutional Investor + References No definition available. + Details
Name: | etm_PercentageOfCommonStockAcquiredThatWillCauseDilutionPassiveInstitutionalInvestor
Namespace Prefix: | etm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Common Stock Owned By Acquired Person, Threshold + References No definition available. + Details
Name: | etm_PercentageOfCommonStockOwnedByAcquiredPersonThreshold
Namespace Prefix: | etm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=etm_ClassARightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=etm_ClassBRightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |