Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 247,800	$ 238,400
Less accumulated depreciation	194,448	183,930
Property and equipment excluding land, net	53,400	54,500
Land	8,000	8,000
Property and equipment, total	61,362	62,498
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 18,600	18,600
Property and equipment, Estimated useful life	40 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 5,200	1,200
Transmission, studio and other broadcast equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 152,700	158,400
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	$ 44,800	33,600
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	$ 4,500	5,400
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	$ 22,000	$ 21,200
Property and equipment, Estimated useful life	Lesser of lease life or useful life