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Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Research services revenues $ 54,235 $ 52,727 $ 160,553 $ 160,998
Advisory services and events revenues 26,134 24,700 86,743 81,651
Total revenues 80,369 77,427 247,296 242,649
Segment expenses 28,160 25,992 88,184 83,797
Contribution margin (loss) 52,209 51,435 159,112 158,852
Selling, marketing, administrative and other expenses (45,263) (43,675) (138,432) (135,463)
Amortization of intangible assets (197) (208) (582) (627)
Reorganization costs       (1,026)
Other income and losses on investments (626) (856) (749) (765)
Income before income taxes 6,123 6,696 19,349 20,971
Product Segment [Member]        
Segment Reporting Information [Line Items]        
Research services revenues 54,235 52,727 160,553 160,998
Advisory services and events revenues 3,353 2,333 15,714 14,191
Total revenues 57,588 55,060 176,267 175,189
Segment expenses 9,764 8,884 32,788 30,306
Contribution margin (loss) 47,824 46,176 143,479 144,883
Research Segment [Member]        
Segment Reporting Information [Line Items]        
Advisory services and events revenues 10,379 10,330 32,279 33,244
Total revenues 10,379 10,330 32,279 33,244
Segment expenses 11,953 11,586 36,510 36,026
Contribution margin (loss) (1,574) (1,256) (4,231) (2,782)
Project Consulting [Member]        
Segment Reporting Information [Line Items]        
Advisory services and events revenues 12,402 12,037 38,750 34,216
Total revenues 12,402 12,037 38,750 34,216
Segment expenses 6,443 5,522 18,886 17,465
Contribution margin (loss) $ 5,959 $ 6,515 $ 19,864 $ 16,751