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, 2021	Dec. 31, 2020
Schedule Of Intangible Assets [Line Items]
Gross Carrying Amount	$ 168,721	$ 153,164
Accumulated Amortization	104,687	103,752
Net Carrying Amount	64,034	49,412
Intangible assets not subject to amortization:
Total intangible assets	273,087	266,065
FCC Licenses and Spectrum Usage Rights
Intangible assets not subject to amortization:
Licenses	$ 209,053	216,653
Television network affiliation agreements
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	6 years
Gross Carrying Amount	$ 60,043	67,488
Accumulated Amortization	53,668	59,726
Net Carrying Amount	$ 6,375	7,762
Customer base
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	8 years
Gross Carrying Amount	$ 74,512	47,052
Accumulated Amortization	20,557	7,874
Net Carrying Amount	$ 53,955	39,178
Pre-sold advertising contracts and other
Schedule Of Intangible Assets [Line Items]
Weighted average remaining life in years	6 years
Gross Carrying Amount	$ 34,166	38,624
Accumulated Amortization	30,462	36,152
Net Carrying Amount	$ 3,704	$ 2,472