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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 4,611,253 $ 4,565,781
Less: accumulated depreciation 2,772,454 2,681,067
Property, plant and equipment, net 1,838,799 1,884,714
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 565,397 562,702
Structures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,890,924 2,864,442
Towers, transmitters and studio equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 357,149 356,664
Furniture and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 727,825 707,163
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 69,958 $ 74,810