v3.25.1
Business Combinations - Additional Information (Detail) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 02, 2024
Jan. 10, 2024
Sep. 01, 2023
Sep. 01, 2022
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Aug. 31, 2023
Business Acquisition [Line Items]                                    
Goodwill         $ 973,398,000       $ 475,814,000       $ 475,814,000 $ 565,493,000 $ 973,398,000 $ 475,814,000 $ 565,493,000  
Fair value of net assets acquired                 16,500,000       16,500,000     16,500,000    
Net loss         (39,721,000) $ (17,430,000) $ (40,203,000) $ (19,509,000) 19,410,000 $ (19,058,000) $ (93,128,000) $ 34,999,000     (116,863,000) (57,777,000) (4,285,000)  
Operating loss         47,856,000 $ 14,377,000 $ 34,418,000 $ 22,458,000 (29,172,000) $ 17,502,000 $ 93,676,000 $ (36,639,000)     119,109,000 45,367,000 11,100,000  
Severance costs outstanding         29,328,000       $ 6,013,000       6,013,000   29,328,000 6,013,000    
Former TechTarget [Member]                                    
Business Acquisition [Line Items]                                    
Business acquisition, share price $ 11.7 $ 11.7                                
Business combination, total consideration transferred $ 951,449,000                                  
Fair value of cash consideration transferred 348,971,000 [1] $ 350,000,000                                
Business combination, Informa common stock consideration transferred [2] 592,707,000                                  
Goodwill 564,657,000                                  
Fair value of net assets acquired 386,792,000                                  
Revenue                             22,900,000      
Business combination, estimated uncollectable 1,900,000                                  
Operating loss                             (9,700,000)      
Business combination, transaction costs         39,700,000                   39,700,000      
Former TechTarget [Member] | Trade Accounts Receivable [Member]                                    
Business Acquisition [Line Items]                                    
Fair value of accounts receivable 37,600,000                                  
Business combination, Gross contractual amount $ 39,500,000                                  
Canalys Acquisition [Member]                                    
Business Acquisition [Line Items]                                    
Date of acquisition     Sep. 01, 2023                              
Business acquired percentage     100.00%                              
Business combination, total consideration transferred     $ 61,586,000                              
Fair value of cash consideration transferred     52,606,000                              
Business combination, Informa common stock consideration transferred     5,000,000                              
Business combination contingent consideration     3,980,000                              
Estimated low range of undiscounted payment     5,000,000                             $ 600,000
Acquired intangible assets     13,935,000                              
Goodwill     49,774,000                              
Total consideration     61,586,000                              
Fair value of net assets acquired     11,812,000                              
Goodwill deductible for tax purposes     0                              
Acquisition costs                               1,000,000    
Revenue                         12,500,000          
Net loss                         $ 3,700,000          
Canalys Acquisition [Member] | Customer Relationships [Member]                                    
Business Acquisition [Line Items]                                    
Acquired intangible assets     10,100,000                              
Canalys Acquisition [Member] | Intellectual Property [Member]                                    
Business Acquisition [Line Items]                                    
Acquired intangible assets     $ 3,800,000                              
Industry Dive [Member]                                    
Business Acquisition [Line Items]                                    
Date of acquisition       Sep. 01, 2022                            
Business acquired percentage       100.00%                            
Business combination, total consideration transferred       $ 522,387,000                            
Fair value of cash consideration transferred       359,287,000                            
Borrowings comprising of interest-bearing loan       42,590,000                            
Acquired intangible assets       218,800,000                            
Goodwill       391,950,000                            
Total consideration       522,387,000                            
Fair value of net assets acquired       130,437,000                            
Goodwill deductible for tax purposes       0                            
Acquisition costs                               $ 1,200,000 $ 7,700,000  
Revenue                           33,800,000        
Net loss                           $ 7,500,000        
Industry Dive [Member] | Customer Relationships [Member]                                    
Business Acquisition [Line Items]                                    
Acquired intangible assets       133,000,000                            
Industry Dive [Member] | Trade Names [Member]                                    
Business Acquisition [Line Items]                                    
Acquired intangible assets       75,000,000                            
Industry Dive [Member] | Intellectual Property [Member]                                    
Business Acquisition [Line Items]                                    
Acquired intangible assets       10,800,000                            
Industry Dive [Member] | 2023 Arrangement [Member]                                    
Business Acquisition [Line Items]                                    
Business combination contingent consideration       53,300,000                            
Industry Dive [Member] | 2023-2025 Arrangement [Member]                                    
Business Acquisition [Line Items]                                    
Business combination contingent consideration       109,800,000                            
Informa TechTarget [Member]                                    
Business Acquisition [Line Items]                                    
Business combination, total consideration transferred       522,400,000                            
Severance costs related to employee-related termination benefits                             2,500,000      
Severance costs outstanding         $ 500,000                   $ 500,000      
Informa TechTarget [Member] | 2023 Arrangement [Member]                                    
Business Acquisition [Line Items]                                    
Business combination, Informa common stock consideration transferred       53,300,000                            
Informa TechTarget [Member] | 2023-2025 Arrangement [Member]                                    
Business Acquisition [Line Items]                                    
Business combination contingent consideration       $ 109,800,000                            
Dive Acquisition [Member]                                    
Business Acquisition [Line Items]                                    
Acquisition cost of debt rate                 5.40%       5.40%     5.40%    
Acquisition average revenue discount rate                 7.30%       7.30%     7.30%    
[1] Represents the total cash consideration paid to Former TechTarget stockholders.
[2] Represents the aggregate fair value of 29,802,846 shares of Informa TechTarget’s common stock that were issued to Former TechTarget shareholders (including certain equity award holders) as purchase consideration as of the Acquisition Date pursuant to the Transaction Agreement. Informa TechTarget’s common stock did not have a readily observable market price at close. Accordingly, Informa TechTarget derived the per share fair value of Informa TechTarget’s stock based on the Former TechTarget’s quoted share price of $31.54 on Nasdaq at the close of trading on December 2, 2024 less the per share cash consideration of approximately $11.70. Informa TechTarget determined that the value of the cash consideration was already reflected in the quoted share price of Former TechTarget shares at close.