PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,320,502	$ 4,436,096
Less: accumulated depreciation	2,372,340	2,223,540
Property, plant and equipment, net	1,948,162	2,212,556
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	570,566	603,234
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,684,673	2,824,794
Towers, transmitters and studio equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	350,760	347,877
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	622,848	591,149
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 91,655	$ 69,042