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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 4,702,633 $ 4,684,901
Less: accumulated depreciation 2,961,395 2,893,761
Property, plant and equipment, net 1,741,238 1,791,140
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 572,362 572,904
Structures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,833,051 2,835,411
Towers, transmitters and studio equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 366,500 365,991
Furniture and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 818,278 793,756
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 112,442 $ 116,839