Segment Information (Total Assets by Segment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total assets	$ 954,450	$ 875,201
Unallocated Assets [Member]
Total assets	100,624	89,344
Disputes, Investigations & Economics [Member]
Total assets	476,736	437,431
Finance, Risk & Compliance Advisory [Member]
Total assets	99,202	92,337
Healthcare [Member]
Total assets	175,430	159,450
Energy [Member]
Total assets	$ 102,458	$ 96,639