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Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 96,353 | $ 89,733 | $ 174,102 | $ 166,927
Segment expenses | 34,731 | 32,800 | 64,425 | 60,024
Contribution margin (loss) | 61,622 | 56,933 | 109,677 | 106,903
Selling, marketing, administrative and other expenses | (50,084) | (46,525) | (100,241) | (93,168)
Amortization of intangible assets | (182) | (194) | (368) | (385)
Acquisition and integration cost | (329) |  | (329) |
Other income and losses on investments | 251 | 70 | 108 | (124)
Income before income taxes | 11,278 | 10,284 | 8,847 | 13,226
Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 41,055 | 38,132 | 75,698 | 73,656
Connect [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 12,538 | 11,960 | 25,102 | 23,597
Analytics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4,707 | 4,483 | 9,200 | 9,065
Research Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 58,300 | 54,575 | 110,000 | 106,318
Advisory Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 11,115 | 9,152 | 20,629 | 17,765
Consulting Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 18,929 | 18,970 | 35,464 | 35,728
Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 8,009 | 7,036 | 8,009 | 7,116
Advisory Services and Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 38,053 | 35,158 | 64,102 | 60,609
Product Organization [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 68,394 | 64,435 | 122,058 | 118,679
Segment expenses | 14,896 | 13,797 | 25,013 | 23,024
Contribution margin (loss) | 53,498 | 50,638 | 97,045 | 95,655
Product Organization [Member] | Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 41,055 | 38,132 | 75,698 | 73,656
Product Organization [Member] | Connect [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 12,538 | 11,960 | 25,102 | 23,597
Product Organization [Member] | Analytics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4,707 | 4,483 | 9,200 | 9,065
Product Organization [Member] | Research Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 58,300 | 54,575 | 110,000 | 106,318
Product Organization [Member] | Consulting Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,085 | 2,824 | 4,049 | 5,245
Product Organization [Member] | Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 8,009 | 7,036 | 8,009 | 7,116
Product Organization [Member] | Advisory Services and Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 10,094 | 9,860 | 12,058 | 12,361
Research Organization [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 13,640 | 11,407 | 25,282 | 21,900
Segment expenses | 12,781 | 12,414 | 25,494 | 24,557
Contribution margin (loss) | 859 | (1,007) | (212) | (2,657)
Research Organization [Member] | Advisory Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 11,013 | 9,056 | 20,493 | 17,592
Research Organization [Member] | Consulting Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,627 | 2,351 | 4,789 | 4,308
Research Organization [Member] | Advisory Services and Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 13,640 | 11,407 | 25,282 | 21,900
Project Consulting [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 14,319 | 13,891 | 26,762 | 26,348
Segment expenses | 7,054 | 6,589 | 13,918 | 12,443
Contribution margin (loss) | 7,265 | 7,302 | 12,844 | 13,905
Project Consulting [Member] | Advisory Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 102 | 96 | 136 | 173
Project Consulting [Member] | Consulting Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 14,217 | 13,795 | 26,626 | 26,175
Project Consulting [Member] | Advisory Services and Events [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 14,319 | $ 13,891 | $ 26,762 | $ 26,348

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