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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
--- | --- | --- | ---
May 01, 2020 | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | $ 243,895 | $ 243,895 | $ 85,165
Acquisitions |  |  |  | 158,569
Translation adjustments |  |  | 3,316 | 161
Goodwill, Ending Balance |  |  | 247,211 | 243,895
Research Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 101,311 | 101,311 | 72,647
Reassignment | $ 4,195 | 130,179 |  | 12,518
Acquisitions |  |  |  | 16,025
Translation adjustments |  |  | 3,228 | 121
Goodwill, Ending Balance |  |  | 238,913 | 101,311
Consulting Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Reassignment | 8,143 |  |  |
Translation adjustments |  |  | 155 |
Goodwill, Ending Balance |  |  | 8,298 |
Product Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  |  |  | 12,518
Reassignment | $ (12,338) | 12,405 |  | (12,518)
Translation adjustments |  |  | (67) |
Sirius Decisions Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 142,584 | $ 142,584 |
Reassignment |  | $ (142,584) |  |
Acquisitions |  |  |  | 142,544
Translation adjustments |  |  |  | 40
Goodwill, Ending Balance |  |  |  | $ 142,584

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