XML 53 R41.htm IDEA: XBRL DOCUMENT v3.3.1.900
Nature of Business - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
Radio_Stations
Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Number of reportable segments | Segment 1
Radio station owns and operated by entity | Radio_Stations 52