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Business Acquisitions - Additional Information (Detail) $ in Millions |  |  |  |  |  |  | 12 Months Ended
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Aug. 05, 2024 USD ($) | May 07, 2024 USD ($) | Jan. 19, 2024 USD ($) | Jan. 09, 2023 USD ($) | Jul. 11, 2022 USD ($) | Jun. 21, 2022 USD ($) | Dec. 31, 2024 USD ($) Acquisitions | Dec. 31, 2023 USD ($) Acquisitions | Dec. 31, 2022 USD ($) Acquisitions
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of business acquired | Acquisitions |  |  |  |  |  |  | 4 | 1 | 2
Goodwill acquired |  |  |  |  |  |  | $ 19.9 | $ 8.4 |
Goodwill |  |  |  |  |  |  | 573.8 | 553.9 | $ 545.5
Contingent consideration on purchase price |  |  |  |  |  |  | 10.7 | 6.9 |
Working capital adjustment receivable from seller |  |  |  |  |  |  | 1.0 |  |
Acquisition costs incurred |  |  |  |  |  |  | $ 3.4 | 2.6 | 3.6
Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average amortization period |  |  |  |  |  |  | 21 years |  |
Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average amortization period |  |  |  |  |  |  | 7 years |  |
Lodestone Events [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 8.4 |  |  |  |  |
Purchase price |  |  |  | 10.2 |  |  |  |  |
Business acquisition, initial cash payment |  |  |  | 9.5 |  |  |  |  |
Intangible assets |  |  |  | 3.4 |  |  |  |  |
Revenues |  |  |  |  |  |  |  | 9.0 |
Net income (loss) |  |  |  |  |  |  |  | 4.4 |
Lodestone Events [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  | 0.4 |  |  |  |  |
Lodestone Events [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 1.1 |  |  |  |  |
Weighted-average amortization period |  |  |  | 5 years |  |  |  |  |
Assumed residual value |  |  |  | $ 0.0 |  |  |  |  |
Lodestone Events [Member] | Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 2.3 |  |  |  |  |
Weighted-average amortization period |  |  |  | 6 years |  |  |  |  |
Assumed residual value |  |  |  | $ 0.0 |  |  |  |  |
Lodestone Events [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  | $ 0.7 |  |  | $ 4.6 |  |
GRC World Forums [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | $ 3.7 |  |  |  |  |  |  |  |
Purchase price | 2.9 |  |  |  |  |  |  |  |
Business acquisition, initial cash payment | 1.2 |  |  |  |  |  |  |  |
Intangible assets | 1.4 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 2.0 |  |
Net income (loss) |  |  |  |  |  |  | 0.3 |  |
GRC World Forums [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred | 0.4 |  |  |  |  |  |  |  |
GRC World Forums [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets | $ 0.4 |  |  |  |  |  |  |  |
Weighted-average amortization period | 3 years |  |  |  |  |  |  |  |
Assumed residual value | $ 0.0 |  |  |  |  |  |  |  |
GRC World Forums [Member] | Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets | $ 1.0 |  |  |  |  |  |  |  |
Weighted-average amortization period | 3 years |  |  |  |  |  |  |  |
Assumed residual value | $ 0.0 |  |  |  |  |  |  |  |
GRC World Forums [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price | 1.2 |  |  |  |  |  | 0.8 |  |
Advertising Week [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 23.6 |  |  |
Purchase price |  |  |  |  |  | 34.3 |  |  |
Business acquisition, initial cash payment |  |  |  |  |  | 28.4 |  |  |
Contingent consideration on purchase price |  |  |  |  |  | 5.9 | $ 2.3 | $ 4.9 |
Intangible assets |  |  |  |  |  | $ 12.4 |  |  |
Revenues |  |  |  |  |  |  |  |  | 14.6
Net income (loss) |  |  |  |  |  |  |  |  | 2.2
Advertising Week [Member] | 2026 Payment [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business combination payment dependent upon compounded annual term |  |  |  |  |  | 5 years | 5 years |  |
Advertising Week [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  | $ 0.6 |  |  |
Advertising Week [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 5.4 |  |  |
Weighted-average amortization period |  |  |  |  |  | 15 years |  |  |
Assumed residual value |  |  |  |  |  | $ 0.0 |  |  |
Advertising Week [Member] | Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 5.9 |  |  |
Weighted-average amortization period |  |  |  |  |  | 10 years |  |  |
Assumed residual value |  |  |  |  |  | $ 0.0 |  |  |
Advertising Week [Member] | Content Intangible Assets [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 1.1 |  |  |
Weighted-average amortization period |  |  |  |  |  | 7 years |  |  |
Assumed residual value |  |  |  |  |  | $ 0.0 |  |  |
Advertising Week [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  |  |  | $ 5.9 | $ 2.3 |  |
Glamping Americas [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | 2.6 |  |  |  |  |  |  |  |
Purchase price | 3.0 |  |  |  |  |  |  |  |
Business acquisition, initial cash payment | 2.3 |  |  |  |  |  |  |  |
Intangible assets | 0.8 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 1.2 |  |
Net income (loss) |  |  |  |  |  |  | 0.4 |  |
Glamping Americas [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred | 0.2 |  |  |  |  |  |  |  |
Glamping Americas [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets | $ 0.2 |  |  |  |  |  |  |  |
Weighted-average amortization period | 4 years |  |  |  |  |  |  |  |
Assumed residual value | $ 0.0 |  |  |  |  |  |  |  |
Glamping Americas [Member] | Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets | $ 0.6 |  |  |  |  |  |  |  |
Weighted-average amortization period | 4 years |  |  |  |  |  |  |  |
Assumed residual value | $ 0.0 |  |  |  |  |  |  |  |
Glamping Americas [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price | $ 0.4 |  |  |  |  |  | 0.4 |  |
The Futurist [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1.8 |  |  |  |  |  |  |
Purchase price |  | 1.9 |  |  |  |  |  |  |
Business acquisition, initial cash payment |  | 1.1 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 1.6 |  |
Net income (loss) |  |  |  |  |  |  | 0.2 |  |
The Futurist [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price |  | $ 0.9 |  |  |  |  | 0.3 |  |
Hotel Interactive [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 11.8 |  |  |  |  |  |
Purchase price |  |  | 13.5 |  |  |  |  |  |
Business acquisition, initial cash payment |  |  | 11.6 |  |  |  |  |  |
Business combination, post close working capital adjustment receivable |  |  | 0.8 |  |  |  |  |  |
Intangible assets |  |  | 4.1 |  |  |  |  |  |
Working capital adjustment receivable from seller |  |  |  |  |  |  | 1.0 |  |
Revenues |  |  |  |  |  |  | 8.6 |  |
Net income (loss) |  |  |  |  |  |  | 0.5 |  |
Hotel Interactive [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  | 0.2 |  |  |  |  |  |
Hotel Interactive [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 1.6 |  |  |  |  |  |
Weighted-average amortization period |  |  | 10 years |  |  |  |  |  |
Assumed residual value |  |  | $ 0.0 |  |  |  |  |  |
Hotel Interactive [Member] | Customer Relationship Intangibles [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 2.5 |  |  |  |  |  |
Weighted-average amortization period |  |  | 4 years |  |  |  |  |  |
Assumed residual value |  |  | $ 0.0 |  |  |  |  |  |
Hotel Interactive [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price |  |  | $ 2.7 |  |  |  | $ 2.0 |  |
Bulletin Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 7.9 |  |  |  |
Purchase price |  |  |  |  | 9.9 |  |  |  |
Business acquisition, initial cash payment |  |  |  |  | 8.9 |  |  |  |
Contingent consideration on purchase price |  |  |  |  | 1.0 |  |  |  |
Intangible assets |  |  |  |  | 2.1 |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ (1.8)
Bulletin Inc [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  | 1.1 |  |  |  |
Bulletin Inc [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 0.1 |  |  |  |
Weighted-average amortization period |  |  |  |  | 3 years |  |  |  |
Assumed residual value |  |  |  |  | $ 0.0 |  |  |  |
Bulletin Inc [Member] | Acquired Technology [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 2.0 |  |  |  |
Weighted-average amortization period |  |  |  |  | 3 years |  |  |  |
Assumed residual value |  |  |  |  | $ 0.0 |  |  |  |
Bulletin Inc [Member] | Estimated Fair Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration on purchase price |  |  |  |  | $ 1.0 |  |  |  |

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