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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of PriceSpective LLC (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 28, 2012
PriceSpective LLC
Feb. 28, 2012
PriceSpective LLC
Customer relationships acquired
Feb. 28, 2012
PriceSpective LLC
Order Backlog
Feb. 28, 2012
PriceSpective LLC
Non-compete Agreements
Business Acquisition [Line Items]              
Property, plant and equipment       $ 256      
Goodwill 357,523 315,441 253,393 42,247 [1]      
Intangible asset         10,237 405 392
Cash and cash equivalents       2,311      
Accounts receivable       2,662      
Unbilled revenue       1,140      
Other current assets       236      
Current liabilities       (7,788)      
Liability arising from contingent consideration arrangement       (15,000)      
Net assets acquired       37,098      
Cash consideration 93,553 72,508 69,836 37,199      
Working capital adjustment       (101)      
Contingent consideration 3,245 45,850   15,000      
Amount of total consideration       52,098      
Contingent consideration       (15,000)      
Net assets acquired       $ 37,098      
[1] Goodwill represents the acquisition of an established workforce with experience in strategic pricing, market access, HEOR, due diligence support and payer engagement services. Goodwill related to the US portion of the business acquired is tax deductible.