v3.25.1
Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Customer
Segment
shares
Dec. 31, 2023
USD ($)
Customer
shares
Dec. 31, 2022
USD ($)
Customer
shares
Significant Accounting Policies [Line Items]            
Unrealized gains (losses) from foreign currency transaction       $ 5,200,000 $ (1,100,000)  
Number of reporting segment | Segment       1    
Number of operating segment | Segment       1    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]       srt:ChiefExecutiveOfficerMember    
Impairment charge $ 139,645,000 $ 139,645,000 $ 139,645,000 $ 66,235,000 139,645,000 $ 0
Impairment to operating lease right-of-use assets       $ 2,000,000 600,000  
Deferred revenue payment terms       30 days    
Advertising costs       $ 300,000 700,000 500,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       3.2    
Reclassifications out of accumulated other comprehensive income       $ 0 $ 0 $ 0
Change in accounting principle, accounting standards update, adopted [true false]       true    
Change in accounting principle, accounting standards update, adoption Date       Dec. 31, 2024    
Accounting Standards Update [Extensible Enumeration]       us-gaap:AccountingStandardsUpdate202307Member    
Informa TechTarget [Member]            
Significant Accounting Policies [Line Items]            
Number of reporting segment | Segment       1    
Number of operating segment | Segment       1    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]       srt:ChiefExecutiveOfficerMember    
Impairment charge $ 139,600,000     $ 66,200,000    
Invoice payment term       30 days    
Upfront percentage of advisory contract bill       50.00%    
Completion percentage of advisory contract bill       50.00%    
Advisory fees       50.00%    
Informa TechTarget [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01            
Significant Accounting Policies [Line Items]            
Percentage of remaining performance obligation       100.00%    
Remaining performance obligation period       12 months    
Restricted Stock Units (RSUs) [Member]            
Significant Accounting Policies [Line Items]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       1.5 0.0 0.0
Convertible Notes [Member]            
Significant Accounting Policies [Line Items]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares         0.0 0.0
Industry Dive [Member]            
Significant Accounting Policies [Line Items]            
Impairment charge       $ 66,200,000    
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Significant Accounting Policies [Line Items]            
Number of customers represented 10% or more of total accounts receivable | Customer       0 0 0
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]            
Significant Accounting Policies [Line Items]            
Number of customers accounted for Specific revenue | Customer       0 0 0
Minimum [Member] | Internal Use Software [Member] | Informa TechTarget [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful lives       3 years    
Maximum [Member] | Internal Use Software [Member] | Informa TechTarget [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful lives       10 years