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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 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 | $ 25.7 | $ 28.0
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 | 0.2 | 1.1
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 | 4.3 | 13.2
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 | 0.2 | 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 | 4.3 | 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 Assets | 25.7 |
Fair Value and Carrying Value on Liabilities |  | 28.0
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 | Digital Reporting Unit Goodwill |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets | 14.7 |
Total Gains (Losses) | (35.4) |
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
Fair Value, Measurements, Nonrecurring | Level 3 | Digital Reporting Unit Goodwill |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets | $ 14.7 |

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