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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 40,806 $ 20,096
Non-cash items included in net income:    
Income tax benefit (4,194)  
Depreciation and amortization and other 393 165
Stock-based compensation 4,045 3,405
Deferred rent 1,286 (69)
Accretion to interest income and other (79) 94
Changes in operating assets and liabilities:    
Accounts receivable 2,546 (3,112)
Other assets (1,230) (761)
Fund management and administration payable (473) 3,747
Compensation and benefits payable (9,887) 5,076
Accounts payable and other liabilities (553) 568
Net cash provided by operating activities 32,660 29,209
Cash flows from investing activities:    
Purchase of fixed assets (3,741) (123)
Purchase of investments (1,237) (2,943)
Cash acquired on acquisition 1,349  
Proceeds from the redemption of investments 803 2,520
Net cash used in investing activities (2,826) (546)
Cash flows from financing activities:    
Shares repurchased (5,426) (249)
Proceeds from exercise of stock options 116 1,073
Net cash (used in)/provided by financing activities (5,310) 824
Increase in cash flows due to changes in foreign exchange rate 7  
Net increase in cash and cash equivalents 24,531 29,487
Cash and cash equivalents-beginning of period 104,316 41,246
Cash and cash equivalents-end of period 128,847 70,733
Supplemental disclosure of cash flow information:    
Cash paid for taxes $ 21 $ 34