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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 |  |
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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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- Definition Business Acquisition Cost Of Acquired Entity Amount Held In Escrow + References No definition available. + Details
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- Definition Business Combination Contingent Consideration Arrangements Cash Payment Made + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References 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=25497992&loc=d3e1392-128463 + Details
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