v3.10.0.1

REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Abstract] |  |  |
Broadcast revenues | $ 1,327,803 | $ 530,553 | $ 428,266
Event and other revenues | 115,399 | 51,434 | 31,805
Trade and barter revenues | 19,365 | 10,897 | $ 4,700
Agency commissions | $ 0 | $ 0 |

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

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

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

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

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