Stockholders' Equity (Schedule Of Net Income (Loss) Attributable To Noncontrolling Interests) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Net Income (Loss) Attributable To Noncontrolling Interests	$ 9,562	$ 8,956	$ 14,538	$ 1,596
Noncontrolling interests	147,276		147,276		143,719
LAZ-MD Holdings [Member]
Net Income (Loss) Attributable To Noncontrolling Interests	4,012	8,476	7,746	(1,243)
Noncontrolling interests	23,803		23,803		22,167
Edgewater [Member]
Net Income (Loss) Attributable To Noncontrolling Interests	5,882	1,270	6,905	3,877
Noncontrolling interests	115,808		115,808		111,289
LAM GPs [Member]
Net Income (Loss) Attributable To Noncontrolling Interests	(159)	(598)	13	(728)
Noncontrolling interests	5,735		5,735		8,219
Other [Member]
Net Income (Loss) Attributable To Noncontrolling Interests	(173)	(192)	(126)	(310)
Noncontrolling interests	$ 1,930		$ 1,930		$ 2,044