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The Company and Significant Accounting Policies - Impairment and Loss on Lease Abandonment - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Station
Sep. 30, 2025
USD ($)
ft²
Facility
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
ft²
Facility
Dec. 31, 2024
USD ($)
Oct. 01, 2024
USD ($)
Accounting Policies [Line Items]              
Goodwill   $ 7,352     $ 7,352 $ 7,352  
Assets held for sale   5,597     $ 5,597    
Impairment charge related to broadcast licenses and fixed assets   5,500 $ 23,700        
Lease expiration date         Jun. 30, 2034    
Operating lease liabilities   7,494     $ 7,494 7,744  
Long-term operating lease liabilities   $ 38,942     $ 38,942 42,101  
Building              
Accounting Policies [Line Items]              
Leased space | ft²   38,000     38,000    
Lease expiration date         Jan. 31, 2034    
Loss on lease abandonment charges     16,100        
Acceleration of depreciation of leasehold improvements     9,100        
Operating lease liabilities   $ 1,700     $ 1,700    
Long-term operating lease liabilities   $ 21,600     $ 21,600    
Number of of leased facilities abandoned | Facility   5     5    
Discontinued Operations Held for Sale              
Accounting Policies [Line Items]              
Number of television stations held for sale | Station 2            
Assets held for sale $ 1,700 $ 3,000 1,700   $ 3,000    
Carrying value of additional assets   3,800     $ 3,800    
Impairment charge related to broadcast licenses and fixed assets   $ 5,500 23,700        
Carrying value of broadcast licenses 28,000   28,000        
Stations fixed assets carrying value 400   400        
Discontinued Operations Held for Sale | Tecate, Mexico              
Accounting Policies [Line Items]              
Assets held for sale 4,700   4,700        
Discontinued Operations Held for Sale | Tijuana, Mexico              
Accounting Policies [Line Items]              
Assets held for sale $ 4,700   $ 4,700        
Meta Platforms              
Accounting Policies [Line Items]              
Impairment charges related to intangible subject to amortization       $ 14,000      
Media              
Accounting Policies [Line Items]              
Goodwill             $ 43,300
Goodwill, impaired, method for fair value determination         As of the most recent annual goodwill testing date, October 1, 2024, there was $43.3 million of goodwill in the media reporting unit. Based on the assumptions and estimates discussed in the Company's 2024 10-K, the media reporting unit carrying value exceeded its fair value, resulting in a goodwill impairment charge of $43.3 million for the year ended December 31, 2024. This impairment charge was a result of the Company updating its internal forecasts of future performance based on lower than anticipated political advertising revenue in the fourth quarter of 2024 and higher projected future costs due to planned investments in news programming and the sales and marketing teams. The calculation of the fair value of the reporting unit requires estimates of the discount rate and the long term projected growth rate.    
Impairment of goodwill           43,300  
Number of of leased facilities abandoned | Facility   5     5    
Media | FCC Licenses              
Accounting Policies [Line Items]              
Impairment charge related to indefinite life intangible assets           $ 17,900  
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]           Asset Impairment Charges  
Media | Meta Platforms              
Accounting Policies [Line Items]              
Impairment of goodwill       $ 35,400      
Advertising Technology & Services              
Accounting Policies [Line Items]              
Goodwill             $ 7,400
Goodwill, impaired, method for fair value determination         Additionally, as of the most recent annual goodwill testing date, October 1, 2024, there was $7.4 million of goodwill in the advertising technology & services reporting unit. Based on the assumptions and estimates discussed in the Company's 2024 10-K, the fair value of the advertising technology & services reporting unit exceeded its carrying value by over 100%, resulting in no impairment charge for the year ended December 31, 2024. The calculation of the fair value of the advertising technology & services reporting unit requires estimates of the discount rate and the long term projected growth rate.    
Percentage of fair value of assets           100.00%  
Impairment of goodwill           $ 0