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Investments (Narrative) (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sale of Equity Method Investment [Abstract]      
Proceeds from sale of equity method investment $ 1,354,000 $ 2,704,000  
Other than temporary impairment for equity method investments   2,600,000 4,800,000
Australian Radio Network [Member]
     
Percentage of ownership 50.00%    
Sale of Equity Method Investment [Abstract]      
Other than temporary impairment for equity method investments $ 95,400,000