Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Sep. 30, 2014 Series A Preferred Stock [Member]	Dec. 31, 2013 Series A Preferred Stock [Member]	Sep. 30, 2014 Series B Preferred Stock [Member]	Dec. 31, 2013 Series B Preferred Stock [Member]	Sep. 30, 2014 Class A Common Stock [Member]	Dec. 31, 2013 Class A Common Stock [Member]	Dec. 31, 2013 Class B Common Stock [Member]
Preferred stock, shares issued	7,921	7,921	0	0
Preferred stock, shares outstanding	7,921	7,921	0	0
Common stock, par value					$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized					500,000,000	500,000,000	1
Common stock, shares issued					129,766,091	129,056,081	1
Common stock, shares outstanding					129,766,091	129,056,081	1
Common stock held by subsidiaries, shares					7,602,792	8,317,065