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Operating Segments - Summary of Information about Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Research services revenues $ 50,622 $ 49,855 $ 153,737 $ 151,445
Advisory services and events revenues 24,741 19,960 77,644 68,684
Total segment revenues 75,363 69,815 231,381 220,129
Segment expenses 28,900 26,024 88,634 80,077
Contribution margin (loss) 46,463 43,791 142,747 140,052
Selling, marketing, administrative and other expenses (41,079) (38,933) (127,300) (119,108)
Amortization of intangible assets (530) (557) (1,605) (1,670)
Reorganization costs/credits 71   (1,817) (1,905)
Other income and gains (losses) on investments 127 (53) 222 476
Income before income taxes 5,052 4,248 12,247 17,845
Products Segment [Member]
        
Segment Reporting Information [Line Items]        
Research services revenues 50,622 49,855 153,737 151,445
Advisory services and events revenues 2,310 2,167 15,161 13,868
Total segment revenues 52,932 52,022 168,898 165,313
Segment expenses 8,298 7,408 28,543 25,902
Contribution margin (loss) 44,634 44,614 140,355 139,411
Selling, marketing, administrative and other expenses     0  
Amortization of intangible assets     0  
Reorganization costs/credits     0  
Other income and gains (losses) on investments     0  
Income before income taxes     0  
Research Segment [Member]
        
Segment Reporting Information [Line Items]        
Research services revenues     0  
Advisory services and events revenues 10,925 12,781 37,573 42,531
Total segment revenues 10,925 12,781 37,573 42,531
Segment expenses 13,012 14,420 40,386 43,006
Contribution margin (loss) (2,087) (1,639) (2,813) (475)
Selling, marketing, administrative and other expenses     0  
Amortization of intangible assets     0  
Reorganization costs/credits     0  
Other income and gains (losses) on investments     0  
Income before income taxes     0  
Project Consulting [Member]
        
Segment Reporting Information [Line Items]        
Research services revenues     0  
Advisory services and events revenues 11,506 5,012 24,910 12,285
Total segment revenues 11,506 5,012 24,910 12,285
Segment expenses 7,590 4,196 19,705 11,169
Contribution margin (loss) 3,916 816 5,205 1,116
Selling, marketing, administrative and other expenses     0  
Amortization of intangible assets     0  
Reorganization costs/credits     0  
Other income and gains (losses) on investments     0  
Income before income taxes     $ 0