v3.25.2
Goodwill - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Goodwill gross carrying amount $ 1,200,000     $ 1,200,000    
Goodwill accumulated impairment losses 1,000,000     1,000,000    
Impairment charge 382,248 $ 459,100 $ 0 841,348 $ 0  
Goodwill 134,978 $ 515,510   $ 134,978   $ 973,398
Period to reach stable growth rate in long term       3 years    
Canalys [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge 15,500     $ 35,200    
Goodwill 17,000     17,000    
Industry Dive [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge 87,900     215,300    
Goodwill 53,800     53,800   269,100
Industry Dive [Member] | As Reported [Member]            
Finite-Lived Intangible Assets [Line Items]            
Goodwill           $ 186,100
NetLine [Member[            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge 14,300     14,300    
Goodwill 27,200     27,200    
Bluefin Legacy [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge 16,300     139,800    
Goodwill 37,000     37,000    
legacy TechTarget [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge 248,200     436,700    
Goodwill $ 0     $ 0    
Level 3 [Member] | Discount Rate [Member] | Maximum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Rate used in impairment test for reporting units 0.15 0.12        
Level 3 [Member] | Discount Rate [Member] | Minimum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Rate used in impairment test for reporting units 0.14 0.10        
Level 3 [Member] | Long-Term Revenue Growth Rate [Member]            
Finite-Lived Intangible Assets [Line Items]            
Rate used in impairment test for reporting units 0.03     0.03