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The Company and Significant Accounting Policies - Financial Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Measurements, Recurring | Money Market Account    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets $ 0.3  
Fair Value, Measurements, Recurring | Corporate Bonds and Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets 4.5 $ 4.7
Fair Value, Measurements, Recurring | Level 1 | Money Market Account    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets 0.3  
Fair Value, Measurements, Recurring | Level 2 | Corporate Bonds and Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets 4.5 4.7
Fair Value, Measurements, Nonrecurring | FCC Licenses    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets   93.5
Total Gains (Losses)   (17.9)
Fair Value, Measurements, Nonrecurring | Assets Held For Sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets 4.7  
Total Gains (Losses) (23.7)  
Fair Value, Measurements, Nonrecurring | Level 1 | Assets Held For Sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets $ 4.7  
Fair Value, Measurements, Nonrecurring | Level 3 | FCC Licenses    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Assets   $ 93.5