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Acquisitions - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jan. 03, 2019 USD ($) Employee	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 244,994	$ 247,211	$ 243,828
Acquisition and integration costs		334	5,779	8,948
Sirius Decisions Segment [Member]
Business Acquisition [Line Items]
Goodwill	$ 142,500
Research Segment [Member]
Business Acquisition [Line Items]
Goodwill	$ 16,000	$ 236,770	$ 238,913	235,685
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Percentage of issued and outstanding shares acquired	100.00%
Number of employees | Employee	350
Consideration paid	$ 245,000
Purchase price paid	246,801
Goodwill	$ 158,569
Revenue				79,300
Direct expenses including intangible amortization				$ 103,900

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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