Regulatory Authorities (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Minimum net capital requirement as defined under securities exchange act	$ 100
LFNY [Member]
Regulatory net capital	167,157
Regulatory capital in excess of minimum requirement	161,116
U.K. Subsidiaries [Member]
Regulatory net capital	152,947
Regulatory capital in excess of minimum requirement	108,653
CFLF [Member]
Regulatory net capital	183,444
Regulatory capital in excess of minimum requirement	84,635
Other U.S. And Non-U.S. Subsidiaries [Member]
Regulatory net capital	82,336
Regulatory capital in excess of minimum requirement	$ 60,121