Condensed Consolidated Statements Of Financial Condition (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 286,239	$ 364,104
Cash segregated under regulatory requirements	3,610	2,398
Loan receivables from related parties	980	980
Securities owned	12,831	11,096
Marketable securities	2,276	4,600
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	839,575	474,269
Accrued commissions receivable, net	180,348	132,885
Loans, forgivable loans and other receivables from employees and partners	176,574	151,328
Fixed assets, net	132,336	133,428
Investments	22,982	25,107
Goodwill	83,564	82,853
Other intangible assets, net	12,456	13,603
Receivables from related parties	6,573	4,958
Other assets	69,064	68,705
Total assets	1,829,408	1,470,314
Liabilities, Redeemable Partnership Interest, and Equity
Accrued compensation	153,653	155,538
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	779,453	429,477
Payables to related parties	7,686	10,262
Accounts payable, accrued and other liabilities	246,608	256,023
Deferred revenue	3,610	4,714
Notes payable and collateralized borrowings	186,490	189,258
Total liabilities	1,377,500	1,045,272
Redeemable partnership interest	94,723	93,186
Equity
Additional paid-in capital	423,167	366,827
Contingent Class A common stock	3,171	3,171
Treasury stock, at cost: 17,951 and 17,936 shares of Class A common stock at June 30, 2011 and December 31, 2010, respectively	(109,753)	(109,627)
Retained deficit	(39,422)	(23,616)
Accumulated other comprehensive income (loss)	278	(977)
Total stockholders' equity	278,828	236,917
Noncontrolling interest in subsidiaries	78,357	94,939
Total equity	357,185	331,856
Total liabilities, redeemable partnership interest, and equity	1,829,408	1,470,314
Class A Common Stock [Member]
Equity
Common stock value	1,039	881
Class B Common Stock [Member]
Equity
Common stock value	$ 348	$ 258