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v3.25.0.1

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 21, 2022 | Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | $ 10.7 | $ 6.9 |
Payment of contingent consideration |  |  |  |  | 3.7 | $ 4.4
Market-based share awards liability |  |  |  | 0.5 | 0.8 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Business combination increase (decrease) in fair value of contingent consideration liability |  |  |  | (1.2) | (2.4) | $ (33.6)
Market-based share awards liability |  |  |  | 0.5 | 0.8 |
Advertising Week [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price | $ 5.9 |  |  | 2.3 | 4.9 |
Plum River [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Payment of contingent consideration |  |  | $ 3.7 |  |  |
AV-IQ [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Payment of contingent consideration |  | $ 0.2 |  |  |  |
Other Acquisitions [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 8.4 | $ 2.0 |
Expected to be Settled in 2025 [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 0.7 |  |
Expected to be Settled in 2025 [Member] | Other Acquisitions [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 0.7 |  |
Expected to be Settled in 2027 [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 9.2 |  |
Expected to be Settled in 2027 [Member] | Other Acquisitions [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 6.9 |  |
Expected to be Settled in 2028 [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | 0.8 |  |
Expected to be Settled in 2028 [Member] | Other Acquisitions [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | $ 0.8 |  |
2026 Payment [Member] | Advertising Week [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Business combination payment dependent upon compounded annual term | 5 years |  |  | 5 years |  |

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