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Interim Consolidated Financial Statements - Revised Consolidated Financial Statements (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues:    
Research services $ 50,793 $ 50,278
Advisory services and events 22,278 21,083
Total revenues 73,071 71,361
Income from operations 20 3,280
Gains (losses) on investments, net 37 (200)
Income before income taxes (7) 3,456
Income tax provision 59 1,287
Net income (66) 2,169
Basic income per common share   $ 0.10
Diluted income per common share   $ 0.10
Cash flows from operating activities:    
Net income (66) 2,169
Net (gains) losses from investments (37) 200
Prepaid expenses and other current assets (2,934) 1,156
Deferred revenue 6,774 2,847
Net cash provided by operating activities   35,453
As Previously Reported [Member]
    
Revenues:    
Research services   50,378
Advisory services and events   21,121
Total revenues   71,499
Income from operations   3,418
Gains (losses) on investments, net   (51)
Income before income taxes   3,743
Income tax provision   1,402
Net income   2,341
Basic income per common share   $ 0.10
Diluted income per common share   $ 0.10
Cash flows from operating activities:    
Net income   2,341
Net (gains) losses from investments   51
Prepaid expenses and other current assets   1,271
Deferred revenue   2,709
Net cash provided by operating activities   35,453
Adjustments [Member]
    
Revenues:    
Research services   (100)
Advisory services and events   (38)
Total revenues   (138)
Income from operations   (138)
Gains (losses) on investments, net   (149)
Income before income taxes   (287)
Income tax provision   (115)
Net income   (172)
Cash flows from operating activities:    
Net income   (172)
Net (gains) losses from investments   149
Prepaid expenses and other current assets   (115)
Deferred revenue   $ 138