Goodwill And Other Intangible Assets (Changes In Carrying Amounts Of Goodwill By Business Segment) (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Balances at January 1, 2011	$ 1,269,447	[1]
Goodwill acquired during the period	15,014
Goodwill contingent consideration related to business combinations	11,719	[2]
Foreign currency translation adjustment and other	(501)
Balances at September 30, 2011	1,295,679
Corporate Finance/Restructuring [Member]
Balances at January 1, 2011	434,439
Goodwill acquired during the period	2,154
Foreign currency translation adjustment and other	(563)
Balances at September 30, 2011	436,030
Forensic And Litigation Consulting [Member]
Balances at January 1, 2011	197,234
Goodwill acquired during the period	976
Goodwill contingent consideration related to business combinations	32	[2]
Foreign currency translation adjustment and other	(60)
Balances at September 30, 2011	198,182
Economic Consulting [Member]
Balances at January 1, 2011	202,689
Goodwill acquired during the period	11,884
Foreign currency translation adjustment and other	(267)
Balances at September 30, 2011	214,306
Technology [Member]
Balances at January 1, 2011	117,960
Foreign currency translation adjustment and other	18
Balances at September 30, 2011	117,978
Strategic Communications [Member]
Balances at January 1, 2011	317,125
Goodwill contingent consideration related to business combinations	11,687	[2]
Foreign currency translation adjustment and other	371
Balances at September 30, 2011	$ 329,183

[1] As Revised (Note 2)

[2] Contingent consideration related to business combinations consummated prior to January 1, 2009.