Property, Plant And Equipment, Intangible Assets And Goodwill (Schedule Of Property, Plant And Equipment) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 4,729,926	$ 4,816,477
Less: accumulated depreciation	2,144,136	2,117,413
Property, plant and equipment, net	2,585,790	2,699,064
Land, buildings and improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	698,642	731,925
Structures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	2,961,735	2,999,582
Towers, transmitters and studio equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	457,517	453,044
Furniture and other equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	544,002	536,255
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 68,030	$ 95,671