Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)	3 Months Ended	39 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Common Class A [Member]
Common stock, par value	$ 0	$ 0	$ 0
Common stock, shares issued	30,189,441	30,189,441	30,180,933
Common stock, shares outstanding	30,189,441	30,189,441	30,180,933
Number Of Common Stock Shares Authorized	Unlimited	Unlimited
Class B Units [Member]
Common stock, par value	$ 0	$ 0	$ 0
Common stock, shares issued	120,763,876	120,763,876	120,267,503
Common stock, shares outstanding	120,763,876	120,763,876	120,267,503
Number Of Common Stock Shares Authorized	Unlimited	Unlimited