Goodwill and Other Intangible Assets - Composition of Company's Acquired Intangible Assets and Associated Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	$ 139,752	$ 137,803
Accumulated Amortization	(87,968)	(75,992)
Net Carrying Amount	51,784	61,811
Intangible assets not subject to amortization:
Total intangible assets	246,958	269,264
FCC Licenses and Spectrum Usage Rights
Intangible assets not subject to amortization:
Licenses	$ 195,174	207,453
Television network affiliation agreements
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	4 years
Gross Carrying Amount	$ 60,043	60,043
Accumulated Amortization	(55,845)	(54,755)
Net Carrying Amount	$ 4,198	5,288
Customer base
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	6 years
Gross Carrying Amount	$ 70,056	68,276
Accumulated Amortization	(26,652)	(17,378)
Net Carrying Amount	$ 43,404	50,898
Pre-sold advertising contracts and other
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	4 years
Gross Carrying Amount	$ 9,653	9,484
Accumulated Amortization	(5,471)	(3,859)
Net Carrying Amount	$ 4,182	$ 5,625