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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, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 242,149 $ 244,994
Foreign currency translation adjustments 2,108 (2,845)
Goodwill, Ending Balance 244,257 242,149
Research Segment [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 234,020 236,770
Foreign currency translation adjustments 2,038 (2,750)
Goodwill, Ending Balance 236,058 234,020
Consulting Segment [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 8,129 8,224
Foreign currency translation adjustments 70 (95)
Goodwill, Ending Balance $ 8,199 $ 8,129