Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amounts Of Goodwill By Operating Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	$ 1,309,358
Goodwill acquired during the year	1,885
Foreign currency translation adjustment and other	8,759
Balances at March 31, 2012	1,320,002
Corporate Finance / Restructuring [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	436,043
Goodwill acquired during the year	1,885
Foreign currency translation adjustment and other	2
Balances at March 31, 2012	437,930
Forensic And Litigation Consulting [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	198,047
Goodwill acquired during the year
Foreign currency translation adjustment and other	995
Balances at March 31, 2012	199,042
Economic Consulting [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	229,487
Goodwill acquired during the year
Foreign currency translation adjustment and other	477
Balances at March 31, 2012	229,964
Technology [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	117,958
Goodwill acquired during the year
Foreign currency translation adjustment and other	59
Balances at March 31, 2012	118,017
Strategic Communications [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Balances at December 31, 2011	327,823
Goodwill acquired during the year
Foreign currency translation adjustment and other	7,226
Balances at March 31, 2012	$ 335,049