Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Maximum contingent consideration due in 2013	$ 4,719
Maximum contingent consideration due in 2014	2,699
Maximum contingent consideration due Total	7,418
Milsom [Member]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	3,600
Maximum contingent consideration due in 2013	302
Maximum contingent consideration due in 2014	0
Maximum contingent consideration due Total	302
Marton House [Member]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	3,750
Maximum contingent consideration due in 2013	1,293
Maximum contingent consideration due in 2014	0
Maximum contingent consideration due Total	1,293
Bath Consulting [Member]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	2,376
Maximum contingent consideration due in 2013	724
Maximum contingent consideration due in 2014	1,099
Maximum contingent consideration due Total	1,823
Communication Consulting [Member]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	700
Maximum contingent consideration due in 2013	300
Maximum contingent consideration due in 2014	0
Maximum contingent consideration due Total	300
Asentus [Member]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	3,700
Maximum contingent consideration due in 2013	2,100
Maximum contingent consideration due in 2014	1,600
Maximum contingent consideration due Total	$ 3,700