PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,472,429	$ 4,320,502
Less: accumulated depreciation	2,545,770	2,372,340
Property, plant and equipment, net	1,926,659	1,948,162
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	572,691	570,566
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,777,063	2,684,673
Towers, transmitters and studio equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	353,983	350,760
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	671,255	622,848
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 97,437	$ 91,655