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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
	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

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