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The Company and Significant Accounting Policies - Fair Value Assets and Liabilities Measured on Recurring Basis and Nonrecurring Basis (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Sep. 30, 2024
Fair Value, Measurements, Recurring | Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Liabilities $ 1.9  
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 1.1 $ 1.9
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 13.2 2.8
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 1.1 1.9
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 13.2 $ 2.8
Fair Value, Measurements, Recurring | Level 3 | Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value and Carrying Value on Liabilities 1.9  
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 27.6  
Total Gains (Losses) (12.3)  
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 $ 27.6