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

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Business Acquisition, Accrued Consideration Payable

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Amount of potential cash payments that could result from the contingent consideration arrangement.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of cash paid to acquire the entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Percentage of voting equity interests acquired 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

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463



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-Number 141R

-Paragraph 68

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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