Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 262,300	$ 247,800
Less accumulated depreciation	(197,645)	(194,448)
Property and equipment excluding land, net	64,700	53,400
Land	6,800	8,000
Property and equipment, total	$ 71,475	61,362
Property and equipment, Estimated useful life	Leasehold improvements and land improvements
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 18,500	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	$ 4,400	5,200
Transmission, studio and other broadcast equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding land gross	$ 152,500	152,700
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	$ 54,700	44,800
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	$ 3,900	4,500
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	$ 28,300	$ 22,000