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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of Firecrest Clinical Limited (Detail)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jul. 14, 2011
Firecrest Clinical Limited
USD ($)
Jul. 14, 2011
Firecrest Clinical Limited
EUR (€)
Sep. 30, 2013
Firecrest Clinical Limited
USD ($)
Sep. 30, 2013
Firecrest Clinical Limited
EUR (€)
Jul. 14, 2011
Firecrest Clinical Limited
Technology Assets
USD ($)
Jul. 14, 2011
Firecrest Clinical Limited
Customer relationships acquired
USD ($)
Jul. 14, 2011
Firecrest Clinical Limited
Order Backlog
USD ($)
Jul. 14, 2011
Firecrest Clinical Limited
Trade Names
USD ($)
Business Acquisition [Line Items]                      
Property, plant and equipment       $ 687              
Goodwill 357,523 315,441 253,393 48,073 [1]              
Intangible asset               11,169 5,243 1,172 1,357
Cash and cash equivalents       1,965              
Other current assets       3,713              
Deferred tax liability       (2,367)              
Other liabilities       (2,521)              
Liability arising from contingent consideration arrangement       (44,028)              
Net assets acquired       24,463              
Cash consideration 93,553 72,508 69,836 24,463 17,000            
Contingent consideration 3,245 45,850   44,028 31,300 13,200 10,000        
Amount of total consideration       68,491              
Contingent consideration       (44,028)              
Net assets acquired       $ 24,463              
[1] Goodwill represents the cost of an established workforce with experience in the development of site performance and study management systems and process related efficiencies expected to be generated from the use of the Firecrest site performance management system and is not tax deductible.