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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 120,381
Impairment	(10,800)	$ (83,895)
Translation adjustments	(461)
Goodwill, Ending Balance	109,120
Research Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	112,080
Impairment	(10,800)
Translation adjustments	(430)
Goodwill, Ending Balance	100,850
Consulting Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,301
Impairment	0
Translation adjustments	(31)
Goodwill, Ending Balance	$ 8,270

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