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Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Research services revenues $ 53,248 $ 51,858
Advisory services and events revenues 24,153 23,329
Total revenues 77,401 75,187
Segment expenses 28,995 28,257
Contribution margin (loss) 48,406 46,930
Selling, marketing, administrative and other expenses (44,470) (44,000)
Amortization of intangible assets (209) (221)
Reorganization costs (1,015) (3,424)
Other income (expense) and losses on investments (328) 263
Income (loss) before income taxes 2,384 (452)
Products Segment [Member]    
Segment Reporting Information [Line Items]    
Research services revenues 53,248 51,858
Advisory services and events revenues 2,701 2,467
Total revenues 55,949 54,325
Segment expenses 8,878 8,349
Contribution margin (loss) 47,071 45,976
Research Segment [Member]    
Segment Reporting Information [Line Items]    
Advisory services and events revenues 10,586 10,327
Total revenues 10,586 10,327
Segment expenses 13,337 12,948
Contribution margin (loss) (2,751) (2,621)
Project Consulting [Member]    
Segment Reporting Information [Line Items]    
Advisory services and events revenues 10,866 10,535
Total revenues 10,866 10,535
Segment expenses 6,780 6,960
Contribution margin (loss) $ 4,086 $ 3,575