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Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total revenues | $ 77,749 | $ 77,194
Segment expenses | 29,694 | 27,224
Contribution margin (loss) | 48,055 | 49,970
Selling, marketing, administrative and other expenses | (50,157) | (46,643)
Amortization of intangible assets | (186) | (191)
Other income (expense) and losses on investments | (143) | (194)
Income (loss) before income taxes | (2,431) | 2,942
Research [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 34,643 | 35,524
Connect [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 12,564 | 11,637
Analytics [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4,493 | 4,582
Research Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 51,700 | 51,743
Advisory Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 9,514 | 8,613
Consulting Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 14,571 | 14,337
Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues |  | 80
Analytics Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,964 | 2,421
Advisory Services and Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 26,049 | 25,451
Product Organization [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 53,664 | 54,244
Segment expenses | 10,117 | 9,227
Contribution margin (loss) | 43,547 | 45,017
Product Organization [Member] | Research [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 34,643 | 35,524
Product Organization [Member] | Connect [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 12,564 | 11,637
Product Organization [Member] | Analytics [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4,493 | 4,582
Product Organization [Member] | Research Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 51,700 | 51,743
Product Organization [Member] | Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues |  | 80
Product Organization [Member] | Analytics Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,964 | 2,421
Product Organization [Member] | Advisory Services and Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,964 | 2,501
Research Organization [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 11,642 | 10,493
Segment expenses | 12,713 | 12,143
Contribution margin (loss) | (1,071) | (1,650)
Research Organization [Member] | Advisory Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 9,480 | 8,536
Research Organization [Member] | Consulting Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,162 | 1,957
Research Organization [Member] | Advisory Services and Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 11,642 | 10,493
Project Consulting [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 12,443 | 12,457
Segment expenses | 6,864 | 5,854
Contribution margin (loss) | 5,579 | 6,603
Project Consulting [Member] | Advisory Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 34 | 77
Project Consulting [Member] | Consulting Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 12,409 | 12,380
Project Consulting [Member] | Advisory Services and Events [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 12,443 | $ 12,457

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