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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 128,670 | $ 113,541 | $ 242,451 | $ 219,886
Segment expenses | (45,300) | (39,175) | (89,056) | (77,337)
Selling, marketing, administrative and other expenses | (66,103) | (57,810) | (124,571) | (117,685)
Amortization of intangible assets | (3,968) | (4,713) | (7,871) | (9,425)
Integration costs | (216) | (612) | (334) | (3,487)
Interest expense, other income (expense) and gains (losses) on investments | (1,267) | 844 | (2,866) | (371)
Income before income taxes | 11,816 | 12,075 | 17,753 | 11,581
Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 93,844 | 86,962 | 181,543 | 173,811
Segment expenses | (29,417) | (25,870) | (60,134) | (53,334)
Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 28,118 | 21,547 | 53,937 | 40,953
Segment expenses | (12,851) | (10,099) | (25,176) | (20,120)
Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 6,708 | 5,032 | 6,971 | 5,122
Segment expenses | (3,032) | (3,206) | (3,746) | (3,883)
Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 81,002 | 75,034 | 155,970 | 149,301
Research [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 81,002 | 75,034 | 155,970 | 149,301
Research [Member] | Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Research [Member] | Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Consulting [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 40,960 | 33,475 | 79,510 | 65,463
Consulting [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 12,842 | 11,928 | 25,573 | 24,510
Consulting [Member] | Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 28,118 | 21,547 | 53,937 | 40,953
Consulting [Member] | Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 6,708 | 5,032 | 6,971 | 5,122
Events [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Events [Member] | Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Events [Member] | Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 6,708 | $ 5,032 | $ 6,971 | $ 5,122

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