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Business Acquisitions - Schedule of Supplemental Pro-Forma Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues | $ 399.7 | $ 395.6 | $ 337.8
Total pro-forma net income (loss) | 1.4 | (6.6) | 128.5
Lodestone Events [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues |  |  | 6.4
Total pro-forma net income (loss) |  |  | 0.5
Advertising Week [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues |  |  | 5.5
Total pro-forma net income (loss) |  |  | (0.7)
Bulletin Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma net income (loss) |  |  | (2.1)
Other 2024 Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues | 0.9 | 4.9 |
Total pro-forma net income (loss) | (0.8) | 0.8 |
Hotel Interactive [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues |  | 7.9 |
Total pro-forma net income (loss) |  | 0.8 |
Emerald Revenue [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma revenues | 398.8 | 382.8 | 325.9
Emerald Net Income (Loss) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total pro-forma net income (loss) | $ 2.2 | $ (8.2) | $ 130.8

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