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Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Research services revenues $ 51,743 $ 53,248
Advisory services and events revenues 25,451 24,153
Total revenues 77,194 77,401
Segment expenses 27,224 27,188
Contribution margin (loss) 49,970 50,213
Selling, marketing, administrative and other expenses (46,643) (46,277)
Amortization of intangible assets (191) (209)
Reorganization costs   (1,015)
Other income (expense) and losses on investments (194) (328)
Income before income taxes 2,942 2,384
Product Segment [Member]    
Segment Reporting Information [Line Items]    
Research services revenues 51,743 53,248
Advisory services and events revenues 2,501 2,701
Total revenues 54,244 55,949
Segment expenses 9,227 8,878
Contribution margin (loss) 45,017 47,071
Research Segment [Member]    
Segment Reporting Information [Line Items]    
Advisory services and events revenues 10,493 10,377
Total revenues 10,493 10,377
Segment expenses 12,143 12,445
Contribution margin (loss) (1,650) (2,068)
Project Consulting [Member]    
Segment Reporting Information [Line Items]    
Advisory services and events revenues 12,457 11,075
Total revenues 12,457 11,075
Segment expenses 5,854 5,865
Contribution margin (loss) $ 6,603 $ 5,210