PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 4,377,360	$ 4,320,502
Less: accumulated depreciation	2,454,729	2,372,340
Property, plant and equipment, net	1,922,631	1,948,162
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	578,194	570,566
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,720,902	2,684,673
Towers, transmitters and studio equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	352,307	350,760
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	652,907	622,848
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 73,050	$ 91,655