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Investments (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jul. 18, 2014
Feb. 18, 2014
Sale of Equity Method Investment [Abstract]              
Other than temporary impairment for equity method investments       $ 11,146 $ (76)    
Australian Radio Network [Member]              
Sale of Equity Method Investment [Abstract]              
Percentage of ownership       50.00%      
Equity Method Ownership Percentage Disposal             50.00%
Other than temporary impairment for equity method investments     $ 95,400        
Equity Method Investment, Realized Gain (Loss) on Disposal   $ (2,400)          
Australian Radio Network [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]              
Sale of Equity Method Investment [Abstract]              
Foreign exchange losses   $ 11,500          
Buspak [Member]              
Sale of Equity Method Investment [Abstract]              
Percentage of ownership       50.00%      
Equity Method Ownership Percentage Disposal           50.00%  
Equity Method Investment, Realized Gain (Loss) on Disposal $ 4,500