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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:        
Net income $ 4,289 $ 6,185 $ 4,223 $ 8,354
Prepaid expenses and other current assets     (797) 4,879
Deferred revenue     (9,110) (13,606)
Net cash provided by operating activities     35,281 37,231
Revenues:        
Research services 52,322 51,312 103,115 101,590
Advisory services and events 30,625 27,641 52,903 48,724
Total revenues 82,947 78,953 156,018 150,314
Income from operations 7,080 9,788 7,100 13,068
Gains (losses) on investments, net 43 98 80 (102)
Income before income taxes 7,202 10,141 7,195 13,597
Income tax provision 2,913 3,956 2,972 5,243
Net income 4,289 6,185 4,223 8,354
Basic income per common share $ 0.23 $ 0.29 $ 0.22 $ 0.38
Diluted income per common share $ 0.23 $ 0.28 $ 0.22 $ 0.38
As Previously Reported [Member]
        
Cash flows from operating activities:        
Net income   5,622   7,963
Prepaid expenses and other current assets       4,619
Deferred revenue       (12,955)
Net cash provided by operating activities       37,231
Revenues:        
Research services   50,512   100,890
Advisory services and events   27,652   48,773
Total revenues   78,164   149,663
Income from operations   8,999   12,417
Gains (losses) on investments, net   (51)   (102)
Income before income taxes   9,203   12,946
Income tax provision   3,581   4,983
Net income   5,622   7,963
Basic income per common share   $ 0.26   $ 0.37
Diluted income per common share   $ 0.26   $ 0.36
Adjustments [Member]
        
Cash flows from operating activities:        
Net income   563   391
Prepaid expenses and other current assets       260
Deferred revenue       (651)
Revenues:        
Research services   800   700
Advisory services and events   (11)   (49)
Total revenues   789   651
Income from operations   789   651
Gains (losses) on investments, net   149    
Income before income taxes   938   651
Income tax provision   375   260
Net income   $ 563   $ 391
Basic income per common share   $ 0.03   $ 0.01
Diluted income per common share   $ 0.02   $ 0.02