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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 |
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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.

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