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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
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%