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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 15, 2016
USD ($)
station
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
market
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Disposal Groups, Including Discontinued Operations [Line Items]            
Amortization expense   $ 56.8   $ 60.7 $ 112.1 $ 123.6
Disposed of by sale | Broadcast communication tower sites and related assets            
Disposal Groups, Including Discontinued Operations [Line Items]            
Radio stations sold | station 6          
Disposal proceeds $ 5.5          
Gain (loss) on disposal 2.7          
Deferred portion of gain on asset disposal $ 1.9          
Disposed of by sale | Non-strategic outdoor markets            
Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal proceeds     $ 594.0      
Gain (loss) on disposal     $ 280.0      
Markets sold | market     9      
Disposed of by sale | International Outdoor, Turkey            
Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on disposal   (56.6)        
Foreign currency translation adjustments   $ 32.2        
Held-for-sale | Outdoor market Indianapolis            
Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal proceeds     $ 41.2