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Revenues - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue From Contract With Customer [Line Items] |  |  |
Current deferred revenues | $ 190.5 | $ 174.3 |
Total deferred revenues | 190.7 | 175.2 | $ 152.6
Cancelled event liabilities | 1.2 | 0.6 |
Provision for expected credit losses | 0.5 | 0.3 |
Accounts receivable write off | $ 0.3 | 0.4 |
Maximum [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Payment term | 60 days |  |
Contracts with customers sales beginning period | 1 year |  |
Contracts with customers commission benefited expected period | 1 year |  |
Minimum [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Payment term | 30 days |  |
Other Noncurrent Liabilities [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Long-term deferred revenues | $ 0.2 | 0.9 |
Trade Shows [Member] | COVID-19 [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Current deferred revenues | 0.1 | 0.5 |
Accounts receivable credits reclassified to cancelled event liabilities | $ 1.1 | $ 0.1 |

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