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Interim Consolidated Financial Statements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended
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Jun. 30, 2013 Research Service Revenue [Member] | Sep. 30, 2012 Research Service Revenue [Member] | Mar. 31, 2012 Research Service Revenue [Member] | Jun. 30, 2013 Research Service Revenue [Member] | Dec. 31, 2011 Research Service Revenue [Member] | Jun. 30, 2013 Technology Related Investment Funds [Member] | Mar. 31, 2013 Technology Related Investment Funds [Member] | Dec. 31, 2012 Technology Related Investment Funds [Member] | Sep. 30, 2012 Technology Related Investment Funds [Member] | Dec. 31, 2012 Technology Related Investment Funds [Member] | Dec. 31, 2011 Technology Related Investment Funds [Member] | Mar. 31, 2013 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Dec. 31, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Sep. 30, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Jun. 30, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Jun. 30, 2013 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Dec. 31, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Dec. 31, 2011 Adjustments Related to Insignificant Variances in Deferred Revenue [Member] | Dec. 31, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member] | Sep. 30, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member] | Jun. 30, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member]
Adjustments related to prior period errors | $ 0.8 | $ 0.1 | $ (0.1) | $ 0.8 | $ 0.1 | $ 0.1 | $ (0.1) | $ (0.1) | $ 0.6 | $ 0.5 | $ (1.4) | $ (0.1) | $ 0.1 | $ 0.2 | $ (0.2) | $ (0.1) | $ 0.1 | $ (0.4) | $ (0.5) | $ 0.3 | $ 0.2

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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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