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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 4,551,520 $ 4,565,781
Less: accumulated depreciation 2,796,241 2,681,067
Property, plant and equipment, net 1,755,279 1,884,714
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 564,528 562,702
Structures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,821,508 2,864,442
Towers, transmitters and studio equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 359,669 356,664
Furniture and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 740,025 707,163
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 65,790 $ 74,810