XML 52 R40.htm IDEA: XBRL DOCUMENT v2.4.1.9
Nature of Business - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Radio_Stations
Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Number of reportable segments 1us-gaap_NumberOfReportableSegments
Radio station owns and operated by entity 53bbgi_RadioStationsOwnedAndOperatedByEntity