Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Property, Plant And Equipment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 4,594,068	$ 4,816,477
Less: accumulated depreciation	2,251,982	2,117,413
Property, plant and equipment, net	2,342,086	2,699,064
Land, buildings and improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	623,946	731,925
Structures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	2,974,643	2,999,582
Towers, transmitters and studio equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	345,002	453,044
Furniture and other equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	579,147	536,255
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 71,330	$ 95,671