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v3.21.1

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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