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Goodwill and Other Intangible Assets - Summary of Goodwill by Segment and Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 244,257 $ 242,149
Foreign currency translation adjustments (1,503) 2,108
Disposition [1] (14,795)  
Goodwill, Ending Balance 227,959 244,257
Research Segment [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 236,058 234,020
Foreign currency translation adjustments (1,449) 2,038
Disposition [1] (14,795)  
Goodwill, Ending Balance 219,814 236,058
Consulting Segment [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 8,199 8,129
Foreign currency translation adjustments (54) 70
Disposition [1] 0  
Goodwill, Ending Balance $ 8,145 $ 8,199
[1] See Note 2 - Divestiture for additional information. The amount of goodwill allocated to the divestiture was determined using a relative fair value approach.