Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 443,338	$ 448,257
Less: accumulated depreciation	(187,435)	(170,187)
Property and equipment, net	255,903	278,070
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	96,071	94,167
Broadcasting and Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	227,578	234,103
Broadcasting and Other Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Broadcasting and Other Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Computer And Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,457	15,903
Computer And Software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	1 year
Computer And Software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Property and equipment, gross	13,709	12,878
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Property and equipment, gross	32,386	32,792
Building
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	20 years
Property and equipment, gross	50,296	48,716
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,841	$ 9,698