Goodwill And Intangible Assets (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Goodwill balance	$ 292,914	$ 291,217
Adjustments to goodwill for prior year acquisitions	(825)
Translation adjustments	2,522
Clinical Development Services [Member]
Goodwill balance	107,214	106,671
Translation adjustments	543
Laboratory Services [Member]
Goodwill balance	185,700	184,546
Adjustments to goodwill for prior year acquisitions	(825)
Translation adjustments	1,979
X-Chem, Inc., [Member]
Adjustments to goodwill for prior year acquisitions	$ 800

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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