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Goodwill - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Unit
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Unit
Finite-Lived Intangible Assets [Line Items]            
Goodwill gross carrying amount $ 1,183,600,000     $ 1,183,600,000    
Goodwill accumulated impairment losses 1,182,500,000     1,182,500,000    
Goodwill 1,094,000 $ 1,077,000   $ 1,094,000   $ 45,550,000
Number of reporting units | Unit       2   5
Impairment charge 0 $ 45,006,000 $ 382,248,000 $ 45,006,000 $ 841,348,000  
Period to reach stable growth rate in long term       3 years    
Post Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Number of reporting units | Unit       2    
Canalys [Member] | Prior to Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge     382,200,000 $ 8,100,000 841,300,000  
Industry Dive [Member] | Prior to Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge     382,200,000   841,300,000  
Bluefin Legacy [Member] | Prior to Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge     382,200,000 3,700,000 841,300,000  
NetLine [Member[ | Prior to Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge       6,800,000    
legacy TechTarget [Member] | Prior to Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge     382,200,000   841,300,000  
Brand to Demand [Member]            
Finite-Lived Intangible Assets [Line Items]            
Goodwill $ 0     0    
Brand to Demand [Member] | Post Reorganization [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment charge       $ 26,400,000    
Intelligence & Advisory [Member]            
Finite-Lived Intangible Assets [Line Items]            
Goodwill     $ 1,100,000   $ 1,100,000  
Level 3 [Member] | Discount Rate [Member] | Maximum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Rate used in impairment test for reporting units       0.255    
Level 3 [Member] | Discount Rate [Member] | Minimum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Rate used in impairment test for reporting units       0.215