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Business Combinations - Additional Information (Detail) (USD $)	6 Months Ended		1 Months Ended	3 Months Ended			1 Months Ended				1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Feb. 15, 2013 Clinical Trial Services	Mar. 31, 2013 Clinical Trial Services	Jun. 30, 2013 Clinical Trial Services	Feb. 15, 2013 Clinical Trial Services Maximum	Aug. 13, 2012 PriceSpective LLC	Feb. 28, 2012 PriceSpective LLC	May 29, 2013 PriceSpective LLC	Feb. 28, 2012 PriceSpective LLC Maximum	Jun. 13, 2013 BeijingWits Medical Limited	Feb. 15, 2012 BeijingWits Medical Limited	Jun. 30, 2013 BeijingWits Medical Limited	Feb. 15, 2012 BeijingWits Medical Limited Maximum	Feb. 15, 2012 BeijingWits Medical Limited Minimum Employee
Business Acquisition [Line Items]
Cash consideration	$ 78,661,000	$ 51,563,000	$ 51,897,000					$ 37,199,000				$ 9,000,000
Additional consideration			2,250,000			3,750,000		15,000,000		15,000,000		7,000,000	3,200,000	7,000,000
Reduction in contingent consideration				1,500,000
Additional consideration liability					2,250,000				10,000,000
Amount held in escrow					2,250,000
Percentage of common stock acquired								100.00%				100.00%
Further consideration paid in relation to certain performance milestones achieved							$ 5,000,000				$ 3,800,000
Addition of new employees															100

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

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Amount of liability recognized arising from contingent consideration in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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