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Operating Segment and Enterprise Wide Reporting - Schedule of Information about Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 98,583 | $ 84,890 | $ 96,353 | $ 77,749 | $ 90,377 | $ 80,369 | $ 89,733 | $ 77,194 | $ 357,575 | $ 337,673 | $ 326,095
Segment expenses |  |  |  |  |  |  |  |  | 129,661 | 119,494 | 112,165
Contribution margin (loss) |  |  |  |  |  |  |  |  | 227,914 | 218,179 | 213,930
Selling, marketing, administrative and other expenses |  |  |  |  |  |  |  |  | (200,540) | (189,849) | (181,299)
Amortization of intangible assets |  |  |  |  |  |  |  |  | (1,162) | (781) | (831)
Acquisition and integration costs |  |  |  |  |  |  |  |  | (3,787) |  |
Reorganization costs |  |  |  |  |  |  |  |  |  |  | (1,026)
Other income and gains (losses) on investments |  |  |  |  |  |  |  |  | 1,100 | (178) | (65)
Income before income taxes |  |  |  |  |  |  |  |  | 23,525 | 27,371 | 30,709
Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 157,669 | 148,935 | 147,576
Connect [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 50,820 | 48,798 | 47,291
Analytics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 19,910 | 18,738 | 20,349
Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 228,399 | 216,471 | 215,216
Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 41,564 | 36,394 | 34,982
Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 74,141 | 73,053 | 65,070
Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 13,471 | 11,755 | 10,827
Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 129,176 | 121,202 | 110,879
Product Organization [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 250,519 | 238,358 | 235,590
Segment expenses |  |  |  |  |  |  |  |  | 50,551 | 45,205 | 41,528
Contribution margin (loss) |  |  |  |  |  |  |  |  | 199,968 | 193,153 | 194,062
Product Organization [Member] | Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 157,669 | 148,935 | 147,576
Product Organization [Member] | Connect [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 50,820 | 48,798 | 47,291
Product Organization [Member] | Analytics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 19,910 | 18,738 | 20,349
Product Organization [Member] | Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 228,399 | 216,471 | 215,216
Product Organization [Member] | Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 8,649 | 10,132 | 9,547
Product Organization [Member] | Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 13,471 | 11,755 | 10,827
Product Organization [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 22,120 | 21,887 | 20,374
Research Organization [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 51,113 | 45,054 | 44,631
Segment expenses |  |  |  |  |  |  |  |  | 51,129 | 48,812 | 47,496
Contribution margin (loss) |  |  |  |  |  |  |  |  | (16) | (3,758) | (2,865)
Research Organization [Member] | Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 41,086 | 36,074 | 34,392
Research Organization [Member] | Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 10,027 | 8,980 | 10,239
Research Organization [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 51,113 | 45,054 | 44,631
Project Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 55,943 | 54,261 | 45,874
Segment expenses |  |  |  |  |  |  |  |  | 27,981 | 25,477 | 23,141
Contribution margin (loss) |  |  |  |  |  |  |  |  | 27,962 | 28,784 | 22,733
Project Consulting [Member] | Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 478 | 320 | 590
Project Consulting [Member] | Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 55,465 | 53,941 | 45,284
Project Consulting [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 55,943 | $ 54,261 | $ 45,874

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