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Operating Segments - Schedule of Information about Reportable Segments, Disaggregation of Revenue by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 113,541 | $ 128,183 | $ 219,886 | $ 228,832
Segment expenses | (39,175) | (51,376) | (77,337) | (91,721)
Selling, marketing, administrative and other expenses | (57,810) | (64,599) | (117,685) | (126,610)
Amortization of intangible assets | (4,713) | (5,099) | (9,425) | (11,309)
Acquisition and integration costs | (612) | (2,487) | (3,487) | (5,454)
Interest expense, other income (expense) and gains (losses) on investments | 844 | (2,179) | (371) | (4,837)
Income (loss) before income taxes | 12,075 | 2,443 | 11,581 | (11,099)
Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 86,972 | 91,303 | 173,794 | 174,299
Segment expenses | (25,870) | (31,209) | (53,334) | (61,148)
Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 21,537 | 18,993 | 40,970 | 36,392
Segment expenses | (10,099) | (9,474) | (20,120) | (18,908)
Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,032 | 17,887 | 5,122 | 18,141
Segment expenses | (3,206) | (10,693) | (3,883) | (11,665)
Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 55,358 | 56,305 | 108,964 | 106,085
Research [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 55,358 | 56,305 | 108,964 | 106,085
Connect [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 13,078 | 14,067 | 26,967 | 27,638
Connect [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 13,078 | 14,067 | 26,967 | 27,638
Analytics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,185 | 5,907 | 10,486 | 11,165
Analytics [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,185 | 5,907 | 10,486 | 11,165
Total Research Revenues [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 73,621 | 76,279 | 146,417 | 144,888
Total Research Revenues [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 73,621 | 76,279 | 146,417 | 144,888
Consulting [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 34,888 | 34,017 | 68,347 | 65,803
Consulting [Member] | Research Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 13,351 | 15,024 | 27,377 | 29,411
Consulting [Member] | Consulting Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 21,537 | 18,993 | 40,970 | 36,392
Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,032 | 17,887 | 5,122 | 18,141
Events [Member] | Events Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 5,032 | $ 17,887 | $ 5,122 | $ 18,141

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