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Property, Plant And Equipment, Intangible Assets And Goodwill (Narrative) (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 16, 2015
USD ($)
Stations
Apr. 03, 2015
USD ($)
Stations
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 11, 2014
Stations
Amortization expense     $ 57,300   $ 65,700 $ 180,900 $ 198,900    
Impairment of intangibles     21,600   $ 400 21,600 $ 400    
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]                  
Gain (loss) on disposal $ 4,400 $ 207,200              
Disposal proceeds 5,900 369,200              
Deferred portion of gain on asset disposal $ 1,700 $ 108,100              
Lease agreements related chareges     $ 5,200     $ 10,200      
Radio stations sold | Stations 9 367              
Sale Leaseback Number Of Radio Station | Stations 7 360              
Americas Outdoor Advertising [Member]                  
Goodwill Impairment Loss               0  
International Outdoor Advertising [Member]                  
Goodwill Impairment Loss               0  
Other [Member]                  
Goodwill Impairment Loss               $ 0  
Vertical Bridge Holdings [Member] | Broadcast Communication Tower Sites [Member] | Maximum [Member]                  
Number of Property Plant and Equipment Sold | Stations                 411