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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, 2024
Dec. 31, 2023
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 66,747 $ 66,747
Accumulated Amortization (62,330) (59,647)
Net Carrying Amount 4,417 7,100
Intangible assets not subject to amortization:    
Total intangible assets 181,693 202,274
FCC Licenses and Spectrum Usage Rights    
Intangible assets not subject to amortization:    
Licenses $ 177,276 195,174
Television network affiliation agreements    
Schedule Of Intangible Assets [Line Items]    
Weighted average remaining life in years 3 years  
Gross Carrying Amount $ 60,043 60,043
Accumulated Amortization (56,933) (55,845)
Net Carrying Amount $ 3,110 4,198
Customer base    
Schedule Of Intangible Assets [Line Items]    
Weighted average remaining life in years 1 year  
Gross Carrying Amount $ 4,890 4,890
Accumulated Amortization (3,865) (2,509)
Net Carrying Amount $ 1,025 2,381
Other    
Schedule Of Intangible Assets [Line Items]    
Weighted average remaining life in years 26 years  
Gross Carrying Amount $ 1,814 1,814
Accumulated Amortization (1,532) (1,293)
Net Carrying Amount $ 282 $ 521