Consolidated Statements of Financial Condition (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 125,919	$ 128,908
Securities available-for-sale, at fair value	17,059	51,208
Accounts receivable, net of allowance of $74 and $75 as of March 31, 2013 and December 31, 2012, respectively	35,467	31,044
Deferred tax assets, net	4,639	9,442
Goodwill and intangible assets, net of accumulated amortization	72,123	33,134
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	18,743	18,009
Prepaid expenses and other assets	8,931	8,096
Total assets	282,881	279,841
Liabilities
Accrued employee compensation	5,751	19,916
Deferred revenue	5,398	4,864
Accounts payable, accrued expenses and other liabilities	19,231	12,344
Total liabilities	30,380	37,124
Commitments and Contingencies
Stockholders' equity
Preferred stock
Additional paid-in capital	283,161	283,609
Treasury stock - Common stock voting, at cost, 1,495,159 shares as of March 31, 2013 and December 31, 2012	(32,273)	(32,273)
Retained earnings (deficit)	4,977	(5,644)
Accumulated other comprehensive loss	(3,483)	(3,093)
Total stockholders' equity	252,501	242,717
Total liabilities and stockholders' equity	282,881	279,841
Series A Preferred Stock
Stockholders' equity
Preferred stock
Common Stock Voting
Stockholders' equity
Common stock	119	118
Total stockholders' equity	119	118
Common Stock Non-Voting
Stockholders' equity
Common stock