Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 169,620	$ 124,994
Securities available-for-sale	78,110	72,552
Accounts receivable, net of allowance of $1,086 and $427 as of December 31, 2011 and 2010, respectively	36,170	25,682
Deferred tax assets, net	8,089	19,813
Goodwill and intangible assets, net of accumulated amortization	34,544	36,012
Capitalized software, furniture, equipment and leasehold improvements, net of accumulated depreciation and amortization	14,460	12,545
Prepaid expenses and other assets	8,465	7,923
Total assets	349,458	299,521
Liabilities
Accrued employee compensation	19,425	17,791
Deferred revenue	5,326	4,571
Accounts payable, accrued expenses and other liabilities	12,268	12,368
Total liabilities	37,019	34,730
Commitments and Contingencies (Note 12)
Stockholders' equity
Preferred stock
Additional paid-in capital	340,716	340,615
Treasury stock-Common stock voting, at cost, 1,541,739 shares and 4,803,740 shares as of December 31, 2011 and 2010, respectively	(25,933)	(70,000)
Accumulated deficit	(584)	(34,605)
Accumulated other comprehensive loss	(1,882)	(1,651)
Total stockholders' equity	312,439	234,476
Total liabilities and stockholders' equity	349,458	299,521
Common Stock Voting
Stockholders' equity
Common stock	113	108
Total stockholders' equity	113	108
Common Stock Non-Voting
Stockholders' equity
Common stock	9	9
Total stockholders' equity	9	9
Series B Preferred Stock
Liabilities
Series B Preferred Stock, $0.001 par value, 35,000 shares authorized; zero and 35,000 issued and outstanding as of December 31, 2011 and 2010, respectively	0	30,315
Series A Preferred Stock
Stockholders' equity
Preferred stock