Subsequent Event (Details) - Subsequent Event $ in Millions	Apr. 15, 2019 USD ($) station
Subsequent Event [Line Items]
Potential sale amount \| $	$ 43
Potential Swap of Radio Stations, Receiving	4
Potential Swap of Radio Stations, Giving	2

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration