Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 126,889	$ 36,354
Cash collateral pledged	9,785	8,633
Securities owned, at fair value	744,914	474,095
Securities purchased under agreements to resell	166,260	97,755
Other investments	61,929	40,320
Receivable from brokers	62,046	95,937
Fees receivable	22,297	31,688
Due from related parties	16,554	16,370
Fixed assets, net of accumulated depreciation and amortization of $23,852 and $17,764, respectively	37,042	36,591
Goodwill	20,028	27,179
Intangible assets, net of accumulated amortization of $20,220 and $8,146, respectively	5,760	12,754
Other assets	26,620	19,456
Cash and cash equivalents, Consolidated Funds	297	7,210
Securities owned, at fair value, Consolidated Funds	6,334	8,722
Other investments, at fair value, Consolidated Funds	228,820	333,374
Other assets, Consolidated Funds	263	732
Total Assets	1,535,838	1,247,170
Liabilities and Stockholders' Equity
Securities sold, not yet purchased, at fair value	334,251	197,916
Securities sold under agreement to repurchase	228,783	192,165
Payable to brokers	213,360	85,655
Compensation payable	71,223	76,204
Short-term borrowings and other debt	5,650	31,733
Fees payable	5,503	8,797
Due to related parties	1,914	9,187
Accounts payable, accrued expenses and other liabilities	61,462	42,267
Capital withdrawals payable, Consolidated Funds	394	7,817
Accounts payable, accrued expenses and other liabilities, Consolidated Funds	246	1,827
Total Liabilities	922,786	653,568
Commitments and Contingencies (Note 19)
Redeemable non-controlling interests	104,587	144,346
Stockholders' Equity
Preferred stock	0	0
Additional paid-in capital	688,427	504,480
(Accumulated deficit) retained earnings	(163,980)	(55,970)
Accumulated other comprehensive income (loss)	(215)	20
Less: Class A common stock held in treasury, at cost	(16,902)	0
Total Stockholders' Equity	508,465	449,256
Liabilities and Stockholders' equity	1,535,838	1,247,170
Common Stock Class A
Stockholders' Equity
Common stock	1,135	726
Common Stock Class B
Stockholders' Equity
Common stock	$ 0	$ 0