Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 119,009	$ 128,908
Securities available-for-sale, at fair value	58,437	51,208
Accounts receivable, net of allowance of $76 and $75 as of September 30, 2013 and December 31, 2012, respectively	36,876	31,044
Goodwill and intangible assets, net of accumulated amortization	69,508	33,134
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	27,617	18,009
Prepaid expenses and other assets	10,543	8,096
Deferred tax assets, net	4,312	9,442
Assets from discontinued operations	6,386
Total assets	332,688	279,841
Liabilities
Accrued employee compensation	19,229	19,916
Deferred revenue	3,106	4,864
Accounts payable, accrued expenses and other liabilities	20,431	12,344
Liabilities from discontinued operations	3,302
Total liabilities	46,068	37,124
Commitments and Contingencies (Note 11)
Stockholders' equity
Preferred stock
Additional paid-in capital	289,911	283,609
Treasury stock - Common stock voting, at cost, 1,495,159 shares as of September 30, 2013 and December 31, 2012	(32,273)	(32,273)
Retained earnings (deficit)	32,794	(5,644)
Accumulated other comprehensive loss	(3,931)	(3,093)
Total stockholders' equity	286,620	242,717
Total liabilities and stockholders' equity	332,688	279,841
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock
Common Stock Voting [Member]
Stockholders' equity
Common stock	119	118
Total stockholders' equity	119	118
Common Stock Non-voting [Member]
Stockholders' equity
Common stock