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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended
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Apr. 17, 2024 | Aug. 03, 2022 USD ($) | Dec. 31, 2024 USD ($) Segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Corporation formation date |  |  | Apr. 26, 2013 |  |
Insurance litigation settlement proceeds relating to event cancellation |  |  | $ 1,500,000 | $ 2,800,000 |
Amounts receivable from credit card processors |  |  | 500,000 | 400,000 |
Purchased of marketable securities |  |  | 0 |  | $ 50,000,000
Uninsured cash and cash equivalents balances |  |  | 194,800,000 | 204,200,000 |
Trade receivables balances |  |  | 82,500,000 | 85,200,000 |
Contingent consideration |  |  | 10,700,000 | 6,900,000 |
Contingent consideration |  |  | 700,000 |  |
Current deferred revenues |  |  | 190,500,000 | 174,300,000 |
Accounts receivable |  |  | 57,500,000 | 54,700,000 |
Insurance settlement received due to lost revenues |  |  | 182,800,000 |  |
Advertising and marketing costs |  |  | $ 8,600,000 | 9,600,000 | 10,100,000
Vesting period |  |  | 10 years |  |
Barter Transactions [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenues recognized |  |  | $ 18,800,000 | 7,000,000 | 1,200,000
Cost of revenues |  |  | $ 18,800,000 | $ 7,000,000 | $ 1,200,000
Chief Operating Decision Maker [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating segment | Segment |  |  | 3 |  |
Number of reportable segments | Segment |  |  | 1 |  |
Number of additional operating segments that do not meet quantitative thresholds for reporting segment | Segment |  |  | 2 |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Content [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 6.00% | 6.00% | 8.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Commerce [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 5.00% | 5.00% | 5.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Trade Show and Other Events [Member] | Connections [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 89.00% | 89.00% | 87.00%
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment , estimated useful life |  |  | 1 year |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment , estimated useful life |  |  | 10 years |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment , estimated useful life |  |  | 1 year |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment , estimated useful life |  |  | 10 years |  |
Money Market Mutual Funds [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | $ 163,700,000 | $ 177,000,000 |
COVID-19 [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Insurance litigation settlement proceeds relating to event cancellation |  | $ 148,600,000 |  |  |
Other income from insurance settlement |  |  |  |  | $ 182,800,000
Contingent Consideration [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Contingent consideration |  |  | 700,000 | 200,000 |
Other Noncurrent Liabilities [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Contingent consideration |  |  | $ 10,000,000 | $ 6,700,000 |
Redeemable Convertible Preferred Stock [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Right to redeem preferred stock threshold period |  |  | 6 years |  |
Consecutive trading days | 20 days |  | 20 days |  |
Redeemable Convertible Preferred Stock [Member] | Onex Partners V LP [Member] | Initial Private Placement [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Preferred stock accretion rate per annum |  |  | 7.00% |  |
Redeemable Convertible Preferred Stock [Member] | After Six Year Anniversary Thereof [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of accreted liquidation preference |  |  | 105.00% |  |
Redeemable Convertible Preferred Stock [Member] | After Seven Year Anniversary Thereof [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of accreted liquidation preference |  |  | 103.00% |  |
Redeemable Convertible Preferred Stock [Member] | Minimum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of trading price per share of common stock | 175.00% |  | 175.00% |  |

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