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Operating Segments - Summary of Information about Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Research services revenues $ 50,793 $ 50,278
Advisory services and events revenues 22,278 21,083
Total segment revenues 73,071 71,361
Segment expenses 28,003 24,801
Contribution margin (loss) 45,068 46,560
Selling, marketing, administrative and other expenses (43,660) (41,130)
Amortization of intangible assets (539) (559)
Reorganization costs (849) (1,591)
Other income and gains/losses on investments (27) 176
Income (loss) before income taxes (7) 3,456
Products Segment [Member]
    
Segment Reporting Information [Line Items]    
Research services revenues 50,793 50,278
Advisory services and events revenues 2,857 2,219
Total segment revenues 53,650 52,497
Segment expenses 8,351 7,570
Contribution margin (loss) 45,299 44,927
Research Segment [Member]
    
Segment Reporting Information [Line Items]    
Research services revenues      
Advisory services and events revenues 13,976 14,938
Total segment revenues 13,976 14,938
Segment expenses 13,975 13,882
Contribution margin (loss) 1 1,056
Project Consulting [Member]
    
Segment Reporting Information [Line Items]    
Research services revenues      
Advisory services and events revenues 5,445 3,926
Total segment revenues 5,445 3,926
Segment expenses 5,677 3,349
Contribution margin (loss) $ (232) $ 577