v3.8.0.1

CONTINGENCIES AND COMMITMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Commitments And Contingencies Disclosure Abstract |  |
Letter of credit requirement | $ 4,176 | $ 1,856
Non recognized revenue - USTN | $ 12,000 |

X
- References No definition available. + Details
Name: | etm_NonRecognizedRevenueUstn
Namespace Prefix: | etm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant