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Operating Segments - Schedule of Information about Reportable Segments, Disaggregation of Revenue by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Total revenues | $ 106,345 | $ 100,649
Segment expenses | (38,162) | (40,345)
Selling, marketing, administrative and other expenses | (59,875) | (62,011)
Amortization of intangible assets | (4,712) | (6,210)
Acquisition and integration costs | (2,875) | (2,967)
Interest expense, other income and gain (loss) on investments | (1,215) | (2,658)
Loss before income taxes | (494) | (13,542)
Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 39,918 | 37,967
Segment expenses | (19,378) | (19,948)
Research Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 66,427 | 62,682
Segment expenses | (18,784) | (20,397)
Research [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 53,606 | 49,780
Research [Member] | Research Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 53,606 | 49,780
Connect [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 13,889 | 13,571
Connect [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 13,889 | 13,571
Analytics [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 5,301 | 5,258
Analytics [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 5,301 | 5,258
Research Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 72,796 | 68,609
Research Services [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 19,190 | 18,829
Research Services [Member] | Research Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 53,606 | 49,780
Consulting [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 33,459 | 31,787
Consulting [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 20,638 | 18,885
Consulting [Member] | Research Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 12,821 | 12,902
Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 90 | 253
Events [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 90 | 253
Advisory Services and Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 33,549 | 32,040
Advisory Services and Events [Member] | Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 20,728 | 19,138
Advisory Services and Events [Member] | Research Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 12,821 | $ 12,902

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