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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research services revenues |  |  |  |  |  |  |  |  | $ 215,216 | $ 210,268 | $ 207,517
Advisory services and events revenues |  |  |  |  |  |  |  |  | 110,879 | 103,458 | 104,545
Total revenues | $ 83,446 | $ 77,427 | $ 87,821 | $ 77,401 | $ 80,975 | $ 74,753 | $ 82,811 | $ 75,187 | 326,095 | 313,726 | 312,062
Segment expenses |  |  |  |  |  |  |  |  | 119,307 | 117,445 | 120,009
Contribution margin (loss) |  |  |  |  |  |  |  |  | 206,788 | 196,281 | 192,053
Selling, marketing, administrative and other expenses |  |  |  |  |  |  |  |  | (174,157) | (172,130) | (169,852)
Amortization of intangible assets |  |  |  |  |  |  |  |  | (831) | (891) | (2,171)
Reorganization costs |  |  |  |  |  |  |  |  | (1,026) | (4,433) | (1,817)
Other income and losses on investments |  |  |  |  |  |  |  |  | (65) | 493 | 176
Income before income taxes |  |  |  |  |  |  |  |  | 30,709 | 19,320 | 18,389
Product Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research services revenues |  |  |  |  |  |  |  |  | 215,216 | 210,268 | 207,517
Advisory services and events revenues |  |  |  |  |  |  |  |  | 20,374 | 17,512 | 20,759
Total revenues |  |  |  |  |  |  |  |  | 235,590 | 227,780 | 228,276
Segment expenses |  |  |  |  |  |  |  |  | 41,528 | 38,615 | 39,466
Contribution margin (loss) |  |  |  |  |  |  |  |  | 194,062 | 189,165 | 188,810
Research Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Advisory services and events revenues |  |  |  |  |  |  |  |  | 45,601 | 42,997 | 48,658
Total revenues |  |  |  |  |  |  |  |  | 45,601 | 42,997 | 48,658
Segment expenses |  |  |  |  |  |  |  |  | 51,132 | 51,510 | 53,307
Contribution margin (loss) |  |  |  |  |  |  |  |  | (5,531) | (8,513) | (4,649)
Project Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Advisory services and events revenues |  |  |  |  |  |  |  |  | 44,904 | 42,949 | 35,128
Total revenues |  |  |  |  |  |  |  |  | 44,904 | 42,949 | 35,128
Segment expenses |  |  |  |  |  |  |  |  | 26,647 | 27,320 | 27,236
Contribution margin (loss) |  |  |  |  |  |  |  |  | $ 18,257 | $ 15,629 | $ 7,892

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