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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