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Business Acquisitions - Additional Information (Detail)
$ in Millions
 12 Months Ended
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