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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, 2022 | Jun. 30, 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 | $ 63.8 | $ 31.0
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 | 1.4 | 1.3
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 | 44.5 | 25.9
Fair Value, Measurements, Recurring | Asset-Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets |  | 0.6
Fair Value, Measurements, Recurring | U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets |  | 0.4
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 | 1.4 | 1.3
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 | 44.5 | 25.9
Fair Value, Measurements, Recurring | Level 2 | Asset-Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets |  | 0.6
Fair Value, Measurements, Recurring | Level 2 | U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value and Carrying Value on Assets |  | 0.4
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 | 63.8 | $ 31.0
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 | 24.5 |
Total Gains (Losses) | (1.6) |
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 | $ 24.5 |

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