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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
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   $ 3.9
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 $ 4.7 13.2
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
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
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 4.7 13.2
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   3.9
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 93.5 27.6
Total Gains (Losses) (17.9) (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 $ 93.5 $ 27.6