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Re-Measured Fair Value of Earn-Out Consideration with Corresponding Changes in Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Schedule of Changes in Fair Value of Contingent Consideration [Line Items] |
Decrease in fair value of earn out consideration | $ (4,452)
Empower Research, LLC |
Schedule of Changes in Fair Value of Contingent Consideration [Line Items] |
Decrease in fair value of earn out consideration | (145)
Triumph Engineering Corporation and Triumph On-Demand Inc |
Schedule of Changes in Fair Value of Contingent Consideration [Line Items] |
Decrease in fair value of earn out consideration | (2,150)
Atyati Technologies Private Limited |
Schedule of Changes in Fair Value of Contingent Consideration [Line Items] |
Decrease in fair value of earn out consideration | (1,794)
High Performance Partners LLC |
Schedule of Changes in Fair Value of Contingent Consideration [Line Items] |
Decrease in fair value of earn out consideration | $ (363)

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- Definition Amount of (increase) decrease in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 + Details
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