Acquisitions (Narrative) (Details) (USD $)	6 Months Ended		0 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	May 14, 2014 Cymetrix [Member] employee	Jun. 30, 2014 Cymetrix [Member]	May 14, 2014 Cymetrix [Member]	Sep. 30, 2014 Cymetrix [Member] Scenario, Forecast [Member]	Jun. 30, 2014 Leerink and HLP [Member] [Member] entity	Jul. 01, 2013 The Anson Group [Member]	Jun. 30, 2014 The Anson Group [Member] item	Jul. 01, 2013 The Anson Group [Member]
Business Acquisition [Line Items]
Number of professionals in acquired entity			600
Cash paid, at closing			$ 76,900,000				$ 6,400,000	$ 3,000,000
Contingent consideration, fair value	23,427,000	6,322,000			25,000,000					3,000,000
Working capital adjustments	600,000					1,400,000
Deferred contingent consideration	26,282,000	8,038,000		20,300,000	20,300,000
Period for additional purchase price payments				90 days
Acquisition costs				1,100,000
Purchase price							8,500,000	5,000,000
Number of businesses acquired							2
Deferred cash payments								$ 2,000,000
Number of deferred acquisition payment installments									3
Contingent consideration, target period									3 years