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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Principles of Consolidation      
Interests in variable interest entities (as a percent) 0.00%    
Revenue recognition      
Additional fee on unspecified future software upgrades $ 0    
Number of revenue recognition criteria | item 4    
Cash and Cash Equivalents      
Maximum original maturity period of cash equivalents 3 months    
Securities Borrowed and Loaned      
Number of parties from whom matched book securities are purchased | item 1    
Client Commission Arrangements      
Client commissions allocated for research $ 110,900 $ 119,400 $ 123,000
Prepaid research, gross 3,500 4,300 4,500
Allowance for prepaid research (100)   (200)
Prepaid research, net of allowance 3,400 4,300 4,300
Accrued research payables 46,274 56,736 52,000
Research and Development      
Research and development costs $ 29,200 $ 35,800 $ 41,700
Maximum      
Principles of Consolidation      
Ownership percentage for equity method investments 50.00%    
Ownership percentage for consolidation of affiliate 50.00%    
Revenue recognition      
Term of agreement 3 years    
Minimum      
Principles of Consolidation      
Ownership percentage for equity method investments 20.00%    
Revenue recognition      
Term of agreement 1 year    
Furniture, fixtures and equipment | Maximum      
Premises and equipment      
Estimated useful life 7 years    
Furniture, fixtures and equipment | Minimum      
Premises and equipment      
Estimated useful life 3 years    
Proprietary software      
Premises and equipment      
Estimated useful life 3 years