TOWER SALE AND LEASEBACK (Details) $ in Millions	12 Months Ended
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

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

No definition available.

Name:	etm_SaleLeasebackTransactionAmortizationOfDeferredGain
Namespace Prefix:	etm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration