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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
 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 15, 2012
BeijingWits Medical Limited
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
Business Acquisition [Line Items]                
Property, plant and equipment       $ 172        
Goodwill 357,523 315,441 253,393 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 93,553 72,508 69,836 9,000        
Contingent consideration 3,245 45,850   7,000 3,200      
Amount of total consideration       16,000        
Contingent consideration       (7,000)        
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.