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Operating Segments - Summary of Information about Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Research services revenues $ 52,322 $ 51,312 $ 103,115 $ 101,590
Advisory services and events revenues 30,625 27,641 52,903 48,724
Total segment revenues 82,947 78,953 156,018 150,314
Segment expenses 31,731 29,252 59,734 54,053
Contribution margin (loss) 51,216 49,701 96,284 96,261
Selling, marketing, administrative and other expenses (42,561) (39,045) (86,221) (80,175)
Amortization of intangible assets (536) (554) (1,075) (1,113)
Reorganization costs (1,039) (314) (1,888) (1,905)
Other income and gains/losses on investments 122 353 95 529
Income before income taxes 7,202 10,141 7,195 13,597
Products Segment [Member]
        
Segment Reporting Information [Line Items]        
Research services revenues 52,322 51,312 103,115 101,590
Advisory services and events revenues 9,994 9,482 12,851 11,701
Total segment revenues 62,316 60,794 115,966 113,291
Segment expenses 11,894 10,924 20,245 18,494
Contribution margin (loss) 50,422 49,870 95,721 94,797
Research Segment [Member]
        
Segment Reporting Information [Line Items]        
Advisory services and events revenues 12,672 14,812 26,648 29,750
Total segment revenues 12,672 14,812 26,648 29,750
Segment expenses 13,399 14,704 27,374 28,586
Contribution margin (loss) (727) 108 (726) 1,164
Project Consulting [Member]
        
Segment Reporting Information [Line Items]        
Advisory services and events revenues 7,959 3,347 13,404 7,273
Total segment revenues 7,959 3,347 13,404 7,273
Segment expenses 6,438 3,624 12,115 6,973
Contribution margin (loss) $ 1,521 $ (277) $ 1,289 $ 300