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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 113,781	$ 106,345
Segment expenses	(43,756)	(38,162)
Selling, marketing, administrative and other expenses	(58,468)	(59,875)
Amortization of intangible assets	(3,903)	(4,712)
Integration costs	(118)	(2,875)
Interest expense, other income (expense) and gains (losses) on investments	(1,599)	(1,215)
Income (loss) before income taxes	5,937	(494)
Research Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	87,699	86,849
Segment expenses	(30,717)	(27,464)
Consulting Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	25,819	19,406
Segment expenses	(12,325)	(10,021)
Events Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	263	90
Segment expenses	(714)	(677)
Research [Member]
Segment Reporting Information [Line Items]
Total revenues	74,968	74,267
Research [Member] | Research Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	74,968	74,267
Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues	38,550	31,988
Consulting [Member] | Research Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	12,731	12,582
Consulting [Member] | Consulting Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	25,819	19,406
Events [Member]
Segment Reporting Information [Line Items]
Total revenues	263	90
Events [Member] | Events Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 263	$ 90

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