Property and Equipment - Property and Equipment (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 234,700,000	$ 227,400,000
Less accumulated depreciation	184,100,000	173,400,000
Property and equipment excluding land, net	50,600,000	54,000,000
Land	8,200,000	7,400,000
Property and equipment, total	58,765,000	61,435,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	18,600,000	18,600,000
Property and equipment, Estimated useful life	39 years
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	2,800,000	1,300,000
Property and equipment, Estimated useful life
Transmission, studio and other broadcast equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	159,900,000	158,000,000
Transmission, studio and other broadcast equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	5 years
Transmission, studio and other broadcast equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	15 years
Office and computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	24,200,000	21,000,000
Office and computer equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	3 years
Office and computer equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	7 years
Transportation equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	6,500,000	6,300,000
Property and equipment, Estimated useful life	5 years
Leasehold improvements and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 22,700,000	$ 22,200,000
Property and equipment, Estimated useful life	Lesser of lease life or useful life