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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.