Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 248,000	$ 242,100
Less accumulated depreciation	198,282	193,532
Property and equipment excluding land, net	49,700	48,600
Land	8,200	8,200
Property and equipment, total	57,874	56,784
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 18,600	18,600
Property and equipment, Estimated useful life	39 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 2,900	2,600
Transmission, studio and other broadcast equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 163,300	162,500
Transmission, studio and other broadcast equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	5 years
Transmission, studio and other broadcast equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	15 years
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 29,600	28,700
Office and computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	3 years
Office and computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated useful life	7 years
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 6,700	6,400
Property and equipment, Estimated useful life	5 years
Leasehold improvements and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 26,900	$ 23,300
Property and equipment, Estimated useful life	Lesser of lease life or useful life