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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenues:        
ETF advisory fees $ 39,437 $ 21,440 $ 105,691 $ 60,645
Other income 193 221 611 579
Total revenues 39,630 21,661 106,302 61,224
Expenses:        
Compensation and benefits 9,648 5,734 26,577 17,068
Fund management and administration 8,794 5,671 26,123 16,677
Marketing and advertising 2,031 862 6,164 3,736
Sales and business development 1,305 831 4,626 2,533
Professional and consulting fees 542 1,305 1,812 3,815
Occupancy, communications, and equipment 723 374 1,691 1,050
Depreciation and amortization 84 79 249 225
Third-party sharing arrangements 374 1,194 913 4,168
Other 1,164 859 3,086 2,211
ETF shareholder proxy       3,264
Patent litigation, net   219   700
Total expenses 24,665 17,128 71,241 55,447
Income before provision for income taxes 14,965 4,533 35,061 5,777
Provision for income taxes            
Net income $ 14,965 $ 4,533 $ 35,061 $ 5,777
Net income per share-basic $ 0.12 $ 0.04 $ 0.28 $ 0.05
Net income per share-diluted $ 0.11 $ 0.03 $ 0.25 $ 0.04
Weighted-average common shares-basic 126,509 123,214 125,909 121,445
Weighted-average common shares-diluted 140,097 138,458 139,805 137,878