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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of BeijingWits Medical Limited (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Feb. 15, 2012 BeijingWits Medical Limited | Jun. 30, 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
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 172 |  |  |  |  |
Goodwill | 354,579 |  | 315,441 | 253,393 | 13,512 | [1] |  |  |  |
Intangible asset |  |  |  |  |  |  |  | 1,761 | 376 | 97
Cash and cash equivalents |  |  |  |  | 587 |  |  |  |  |
Accounts receivable |  |  |  |  | 657 |  |  |  |  |
Unbilled revenue |  |  |  |  | 176 |  |  |  |  |
Other current assets |  |  |  |  | 228 |  |  |  |  |
Deferred tax liability |  |  |  |  | (559) |  |  |  |  |
Current liabilities |  |  |  |  | (1,007) |  |  |  |  |
Liability arising from contingent consideration arrangement |  |  |  |  | (7,000) |  |  |  |  |
Net assets acquired |  |  |  |  | 9,000 |  |  |  |  |
Cash consideration | 78,661 | 51,563 |  |  | 9,000 |  |  |  |  |
Contingent consideration |  |  |  |  | 7,000 |  | 3,200 |  |  |
Amount of total consideration |  |  |  |  | 16,000 |  |  |  |  |
Liabilities included in preliminary purchase price allocation re contingent consideration |  |  |  |  | (7,000) |  | (3,200) |  |  |
Net assets acquired |  |  |  |  | $ 9,000 |  |  |  |  |
[1] | Goodwill represents the acquisition of an established workforce with experience in clinical trial execution and regulatory processes in China and is not tax deductible.

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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