v3.8.0.1

TOWER SALE AND LEASEBACK (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) number
Tower Sale And Leaseback [Abstract] |
Operating Lease Remaining Life Amortization Period | number | 16.5
Sale Leaseback Transaction Amortization Of Deferred Gain | $ | $ 0.6

X
- Definition The reminaing life of the lease that will be used to amortize, on a straightline basis, the deferred gain. + References No definition available. + Details
Name: | etm_OperatingLeaseRemainingLifeAmortizationPeriod
Namespace Prefix: | etm_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized beyond the next year + References No definition available. + Details
Name: | etm_SaleLeasebackTransactionAmortizationOfDeferredGain
Namespace Prefix: | etm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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