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Property, Plant And Equipment, Intangible Assets And Goodwill (Narrative) (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 16, 2015
USD ($)
Stations
Apr. 03, 2015
USD ($)
Stations
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 11, 2014
Stations
Dec. 31, 2013
USD ($)
Amortization expense     $ 60,700   $ 66,300 $ 123,600 $ 133,200      
Purchase price           0 $ 0      
Goodwill     4,177,772     4,177,772   $ 4,187,424   $ 4,202,187
Goodwill Impairment Loss               0    
Annual lease payments       $ 2,600            
Two Buildings [Member]                    
Disposal proceeds       34,300            
One Building [Member]                    
Gain (loss) on disposal       $ 8,100            
Broadcast Communication Tower Sites [Member]                    
Annual lease payments $ 300                  
Gain (loss) on disposal     207,200              
Disposal proceeds $ 5,900                  
Deferred portion of gain on asset disposal     108,100     108,100        
Lease agreements related chareges     5,100              
Radio stations sold | Stations 9                  
Sale Leaseback Number Of Radio Station | Stations 7 360                
Sale Leaseback Transaction, Lease Terms The leases entered into as a part of these transactions are for a term of fifteen years and include three optional five-year renewal periods.                  
Americas Outdoor Advertising [Member]                    
Goodwill     584,262     584,262   584,574   585,227
Goodwill Impairment Loss               0    
International Outdoor Advertising [Member]                    
Goodwill     223,198     223,198   232,538   264,907
Goodwill Impairment Loss               0    
Other [Member]                    
Goodwill     $ 117,545     $ 117,545   117,545   $ 117,246
Goodwill Impairment Loss               $ 0    
Vertical Bridge Holdings [Member] | Broadcast Communication Tower Sites [Member]                    
Disposal proceeds   $ 369,200                
Number of Property Plant and Equipment Sold | Stations   367                
Vertical Bridge Holdings [Member] | Broadcast Communication Tower Sites [Member] | Maximum [Member]                    
Number of Property Plant and Equipment Sold | Stations                 411