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Description of Business, Interim Financial Data and Basis of Presentation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended
Sep. 30, 2014
Affiliate
Market
Station
Apr. 15, 2014
San Francisco Baseball Associates, LLC
Apr. 15, 2014
San Francisco Baseball Associates, LLC
Other income (expense), net
Sep. 30, 2014
Land and Building
Accounting Policies [Line Items]        
Number of owned and operated radio stations 460      
Number of markets 90      
Number of radio stations 9,000      
Due diligence period       60 days
Class B Membership Interest (percentage)   1.59%    
Sales price for Class B Membership Interest   $ 13.0    
Gain on sale of Class B Membership Interest     $ 3.2