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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
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Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 85,165 | $ 76,169
Acquisitions | 158,569 | 10,178
Translation adjustments | 161 | (1,182)
Goodwill, Ending Balance | 243,895 | 85,165
Product Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 12,518 | 2,438
Reassignment | (12,518) |
Acquisitions |  | 10,178
Translation adjustments |  | (98)
Goodwill, Ending Balance |  | 12,518
Research Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 72,647 | 73,731
Reassignment | 12,518 |
Acquisitions | 16,025 |
Translation adjustments | 121 | (1,084)
Goodwill, Ending Balance | 101,311 | $ 72,647
Sirius Decisions Segment [Member] |  |
Goodwill [Line Items] |  |
Acquisitions | 142,544 |
Translation adjustments | 40 |
Goodwill, Ending Balance | $ 142,584 |

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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