Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Business Acquisition [Line Items]
Liability as of December 31, 2012	$ 3,084
2013 Additions (Payments)	2,509
Change in Fair Value of Contingent Consideration	(1,676)
Foreign Currency Translation	(120)
Liability as of December 31, 2013	3,797
Milsom [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	302
2013 Additions (Payments)	(299)
Change in Fair Value of Contingent Consideration	0
Foreign Currency Translation	(3)
Liability as of December 31, 2013	0
Marton House [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	774
2013 Additions (Payments)	(759)
Change in Fair Value of Contingent Consideration	32
Foreign Currency Translation	(47)
Liability as of December 31, 2013	0
Bath Consulting [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	1,464
2013 Additions (Payments)	(676)
Change in Fair Value of Contingent Consideration	228
Foreign Currency Translation	(19)
Liability as of December 31, 2013	997
Asentus [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	544
2013 Additions (Payments)	0
Change in Fair Value of Contingent Consideration	(533)
Foreign Currency Translation	(11)
Liability as of December 31, 2013	0
Prospero [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	0
2013 Additions (Payments)	3,670
Change in Fair Value of Contingent Consideration	(1,727)
Foreign Currency Translation	(102)
Liability as of December 31, 2013	1,841
Lorien [Member]
Business Acquisition [Line Items]
Liability as of December 31, 2012	0
2013 Additions (Payments)	573
Change in Fair Value of Contingent Consideration	324
Foreign Currency Translation	62
Liability as of December 31, 2013	$ 959