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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 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 | $ 0.1 |
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 | 4.8 | $ 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 | 0.1 |
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 | 4.8 | 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 2 | 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

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