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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of Clinical Trial Services (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, 2013
Clinical Trial Services
Business Acquisition [Line Items]          
Property, plant and equipment         $ 339
Goodwill 354,579   315,441 253,393 43,877 [1]
Cash and cash equivalents         1,039
Accounts receivable         9,185
Unbilled revenue         2,128
Prepayments and other current assets         414
Other liabilities         (2,835)
Liability arising from contingent consideration arrangement         (2,250)
Net assets acquired         51,897
Cash consideration 78,661 51,563     51,897
Contingent consideration         2,250
Amount of total consideration         54,147
Liabilities included in preliminary purchase price allocation re contingent consideration         (2,250)
Net assets acquired         $ 51,897
[1] Goodwill represents the acquisition of an established workforce with experience in the clinical research industry, thereby allowing the Company to enhance its capabilities in global resourcing and FSP and also medical and safety services. Goodwill related to the US portion of the business acquired is tax deductible.