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Intangible Assets - Additional Information (Detail) (USD $) | 12 Months Ended | 10 Months Ended | 1 Months Ended | 35 Months Ended | 1 Months Ended | 36 Months Ended | 1 Months Ended | 43 Months Ended | 1 Months Ended | 62 Months Ended | 1 Months Ended | 71 Months Ended | 1 Months Ended | 10 Months Ended | 1 Months Ended | 10 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 BeijingWits Medical Limited | Feb. 15, 2012 BeijingWits Medical Limited Customer relationships acquired | Feb. 15, 2012 BeijingWits Medical Limited Order Backlog | Feb. 15, 2012 BeijingWits Medical Limited Non-compete Agreements | Dec. 31, 2013 Firecrest Clinical Limited | Jul. 14, 2011 Firecrest Clinical Limited Customer relationships acquired | Jul. 14, 2011 Firecrest Clinical Limited Order Backlog | Jul. 14, 2011 Firecrest Clinical Limited Technology Assets | Jul. 14, 2011 Firecrest Clinical Limited Trade Names | Dec. 31, 2013 Oxford Outcomes Limited | Jan. 14, 2011 Oxford Outcomes Limited Customer relationships acquired | Jan. 14, 2011 Oxford Outcomes Limited Order Backlog | Dec. 31, 2013 Timaq Medical Imaging | May 17, 2010 Timaq Medical Imaging Customer relationships acquired | Dec. 31, 2013 Prevalere Life Sciences | Nov. 14, 2008 Prevalere Life Sciences Volunteer list acquired | Nov. 14, 2008 Prevalere Life Sciences Minimum Volunteer list acquired | Nov. 14, 2008 Prevalere Life Sciences Maximum Volunteer list acquired | Dec. 31, 2013 Healthcare Discoveries Inc | Feb. 11, 2008 Healthcare Discoveries Inc Customer relationships acquired | Feb. 11, 2008 Healthcare Discoveries Inc Volunteer list acquired | Feb. 11, 2008 Healthcare Discoveries Inc Minimum Customer relationships acquired | Feb. 11, 2008 Healthcare Discoveries Inc Minimum Volunteer list acquired | Feb. 11, 2008 Healthcare Discoveries Inc Maximum Customer relationships acquired | Dec. 31, 2012 PriceSpective LLC | Feb. 28, 2012 PriceSpective LLC Customer relationships acquired | Feb. 28, 2012 PriceSpective LLC Order Backlog | Feb. 28, 2012 PriceSpective LLC Non-compete Agreements | Dec. 31, 2013 Clinical Trial Services | Feb. 15, 2013 Clinical Trial Services Customer relationships acquired | Feb. 15, 2013 Clinical Trial Services Order Backlog
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of amortizable intangible asset acquired |  |  |  |  | $ 1,800,000 | $ 400,000 | $ 10,000 |  | $ 5,200,000 | $ 1,200,000 | $ 11,200,000 | $ 1,400,000 |  | $ 6,600,000 | $ 600,000 |  | $ 800,000 |  | $ 7,400,000 |  |  |  | $ 1,600,000 | $ 1,300,000 |  |  |  |  | $ 10,200,000 | $ 400,000 | $ 400,000 |  | $ 3,300,000 | $ 600,000
Amortization period |  |  |  |  | 10 years | 4 years | 5 years |  | 7 years 6 months | 1 year 2 months 12 days | 7 years 6 months | 4 years 6 months |  | 6 years 6 months | 2 years |  | 3 years |  |  | 7 years | 11 years |  |  |  | 2 years | 6 years | 9 years |  | 10 years | 9 months 18 days | 3 years |  | 3 years | 1 year
Amount amortized in the period since the date of acquisition | $ 7,539,000 | $ 7,613,000 | $ 4,652,000 | $ 549,000 |  |  |  | $ 6,807,000 |  |  |  |  | $ 3,706,000 |  |  | $ 770,000 |  | $ 4,162,000 |  |  |  | $ 2,547,000 |  |  |  |  |  | $ 2,521,000 |  |  |  | $ 1,488,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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