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Business Acquisitions - Summary of Purchase Price Allocation and Measurement Period Adjustment (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Aug. 05, 2024 | Jan. 19, 2024 | Dec. 31, 2023 | Jan. 09, 2023 | Dec. 31, 2022 | Jul. 11, 2022 | Jun. 21, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 573.8 |  |  | $ 553.9 |  | $ 545.5 |  |
Bulletin Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade receivables and prepaid expenses |  |  |  |  |  |  | $ 0.4 |
Goodwill |  |  |  |  |  |  | 7.9 |
Intangible assets |  |  |  |  |  |  | 2.1 |
Accounts payable and other current liabilities |  |  |  |  |  |  | (0.5) |
Purchase price, including working capital adjustment |  |  |  |  |  |  | $ 9.9 |
Lodestone Events [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  | $ 1.8 |  |  |
Prepaid expenses and other current assets |  |  |  |  | 0.2 |  |  |
Goodwill |  |  |  |  | 8.4 |  |  |
Intangible assets |  |  |  |  | 3.4 |  |  |
Deferred revenues |  |  |  |  | (3.6) |  |  |
Purchase price, including working capital adjustment |  |  |  |  | $ 10.2 |  |  |
Advertising Week [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  |  |  |  | $ 3.8
Prepaid expenses and other current assets |  |  |  |  |  |  |  | 0.3
Goodwill |  |  |  |  |  |  |  | 23.6
Intangible assets |  |  |  |  |  |  |  | 12.4
Right-of-use lease asset |  |  |  |  |  |  |  | 1.2
Accounts payable and other current liabilities |  |  |  |  |  |  |  | (2.7)
Deferred revenues |  |  |  |  |  |  |  | (3.1)
Right-of-use lease liability |  |  |  |  |  |  |  | (1.2)
Purchase price, including working capital adjustment |  |  |  |  |  |  |  | $ 34.3
GRC World Forums [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade and other receivables |  | $ 0.2 |  |  |  |  |  |
Goodwill |  | 3.7 |  |  |  |  |  |
Intangible assets |  | 1.4 |  |  |  |  |  |
Accounts payable and other current liabilities |  | (1.2) |  |  |  |  |  |
Deferred revenues |  | (1.2) |  |  |  |  |  |
Purchase price, including working capital adjustment |  | 2.9 |  |  |  |  |  |
Glamping Americas [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade and other receivables |  | 0.1 |  |  |  |  |  |
Prepaid expenses and other current assets |  | 0.2 |  |  |  |  |  |
Goodwill |  | 2.6 |  |  |  |  |  |
Intangible assets |  | 0.8 |  |  |  |  |  |
Deferred revenues |  | (0.7) |  |  |  |  |  |
Purchase price, including working capital adjustment |  | $ 3.0 |  |  |  |  |  |
Hotel Interactive [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Trade and other receivables |  |  | $ 1.2 |  |  |  |  |
Prepaid expenses and other current assets |  |  | 1.1 |  |  |  |  |
Goodwill |  |  | 11.8 |  |  |  |  |
Intangible assets |  |  | 4.1 |  |  |  |  |
Deferred revenues |  |  | (4.7) |  |  |  |  |
Purchase price, including working capital adjustment |  |  | $ 13.5 |  |  |  |  |

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