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Goodwill - Additional Information (Detail) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | May 29, 2013 PriceSpective LLC USD ($) | Aug. 13, 2012 PriceSpective LLC USD ($) | Feb. 28, 2012 PriceSpective LLC USD ($) | Feb. 28, 2012 PriceSpective LLC Initial USD ($) | Feb. 28, 2012 PriceSpective LLC Maximum USD ($) | Jun. 13, 2013 BeijingWits Medical Limited USD ($) | Feb. 15, 2012 BeijingWits Medical Limited USD ($) | Dec. 31, 2013 BeijingWits Medical Limited USD ($) | Feb. 15, 2012 BeijingWits Medical Limited Maximum USD ($) | Feb. 15, 2012 BeijingWits Medical Limited Minimum Employee | Jul. 31, 2012 Firecrest Clinical Limited USD ($) | Jul. 31, 2012 Firecrest Clinical Limited EUR (€) | Mar. 31, 2012 Firecrest Clinical Limited USD ($) | Mar. 31, 2012 Firecrest Clinical Limited EUR (€) | Jul. 14, 2011 Firecrest Clinical Limited USD ($) | Jul. 14, 2011 Firecrest Clinical Limited EUR (€) | Sep. 30, 2013 Firecrest Clinical Limited USD ($) | Sep. 30, 2013 Firecrest Clinical Limited EUR (€) | Jul. 14, 2011 Firecrest Clinical Limited Maximum USD ($) | Jul. 14, 2011 Firecrest Clinical Limited Maximum EUR (€) | Feb. 15, 2013 Clinical Trial Services USD ($) | Dec. 31, 2013 Clinical Trial Services USD ($) | Oct. 30, 2013 Clinical Trial Services USD ($) | Dec. 31, 2013 Clinical Trial Services Maximum USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 93,553,000 | $ 72,508,000 | $ 69,836,000 |  |  | $ 37,199,000 | $ 37,100,000 |  |  | $ 9,000,000 |  |  |  |  |  |  |  | $ 24,463,000 | € 17,000,000 |  |  |  |  | $ 51,897,000 |  |  |
Additional consideration | 3,245,000 | 45,850,000 |  |  |  | 15,000,000 |  | 15,000,000 |  | 7,000,000 | 3,200,000 | 7,000,000 |  |  |  |  |  | 44,028,000 | 31,300,000 | 13,200,000 | 10,000,000 | 46,800,000 | 33,000,000 |  |  |  | 3,750,000
Reduction in additional consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,750,000 |  |
Working capital adjustment |  |  |  |  |  | 101,000 |  |  |  |  |  |  |  |  |  | 500,000 | 400,000 |  |  |  |  |  |  | (199,000) |  | 199,000 |
Percentage of common stock acquired |  |  |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |
Further consideration paid in relation to certain performance milestones achieved |  |  |  | $ 10,000,000 | $ 5,000,000 |  |  |  | $ 3,800,000 |  |  |  |  | $ 12,500,000 | € 10,000,000 | $ 4,000,000 | € 3,000,000 |  |  |  |  |  |  |  |  |  |
Addition of new employees |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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- Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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