Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 235,290	$ 236,930
Less accumulated depreciation	(135,823)	(125,708)
Property, plant and equipment	99,467	111,222
Land
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	28,846	37,107
Buildings
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	24,663	24,690
Office Furnishings And Equipment
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	37,935	37,523
Antennae, Towers and Transmitting Equipment
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	74,897	73,517
Studio and Production Equipment
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	29,234	29,110
Computer Software and Website Development Costs
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	18,859	14,817
Record and Tape Libraries
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	65	65
Automobiles
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	1,107	1,031
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	16,721	16,558
Construction in Progress
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 2,963	$ 2,512