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v3.25.3

Revenues - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenue From Contract With Customer [Line Items] |  |  |  |  |
Current deferred revenues | $ 229.0 |  | $ 229.0 |  | $ 190.5
Revenue recognized |  |  | 162.7 |  |
Cancelled event liabilities | 1.0 |  | 1.0 |  | 1.2
Provision for expected credit losses | 0.5 |  | 1.4 | $ 0.5 |
Accounts receivable write off | 0.6 |  | $ 1.0 |  |
Maximum [Member] |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |
Payment term |  |  | 60 days |  |
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 | $ 0.4 |  | $ 0.4 |  |
Trade Show and Other Events [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |
Concentration risk, percentage | 87.10% | 86.00% | 91.10% | 89.30% |
Trade Shows [Member] | COVID-19 [Member] |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |
Current deferred revenues | $ 0.8 |  | $ 0.8 |  |
Accounts receivable credits reclassified to cancelled event liabilities | $ 0.2 |  | $ 0.2 |  | $ 1.1

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