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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 227,959		$ 227,959
Impairment	$ 0	(83,900)	$ 0	(83,895)	$ 0
Translation adjustments				3,131
Goodwill, Ending Balance	147,195			147,195
Research Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		219,814		219,814
Impairment				(83,895)
Translation adjustments				2,980
Goodwill, Ending Balance	138,899			138,899
Consulting Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 8,145		8,145
Impairment				0
Translation adjustments				151
Goodwill, Ending Balance	$ 8,296			$ 8,296

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