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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Property, Plant And Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,576,512	$ 4,565,781
Less: accumulated depreciation	2,857,421	2,681,067
Property, plant and equipment, net	1,719,091	1,884,714
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	568,499	562,702
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,808,059	2,864,442
Towers, transmitters and studio equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	362,158	356,664
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	750,459	707,163
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 87,337	$ 74,810

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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