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Collateralized Transactions - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2013
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2015
Dec. 31, 2015
USD ($)
dealer
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Bank call loans         $ 100,200,000 $ 59,400,000  
Amounts pledged         546,334,000 518,123,000  
Customer securities under customer margin loans available to be pledged         1,400,000,000    
Customer securities under customer margin loans agreement available to be repledged         88,500,000    
Customer securities deposited to secure obligations and margin requirements under option contracts         416,000,000    
Outstanding letters of credit         0    
Fair value of the reverse repurchase agreements         206,499,000 [1] 250,000,000 [2]  
Fair value of the repurchase agreements         0    
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty         546,300,000 518,100,000  
Carrying value of securities owned by the Company loaned or pledged         $ 142,700,000 149,100,000  
Amount of first interim distribution $ 9,500,000 $ 437,000 $ 600,000        
Number of broker-dealers | dealer         3    
Receivable from brokers and clearing organizations         $ 129,900,000    
Loans to citizens         $ 0    
Minimum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Period to complete transactions       1 day      
Maximum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Period to complete transactions       3 days      
Credit Concentration Risk              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Guaranteed mortgages for a period         15 days    
Interest expense         $ 928,500 570,700 $ 764,500
Reverse Repurchase Agreements              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Customer securities under customer margin loans agreement available to be repledged         278,800,000 312,600,000  
Securities received as collateral under securities borrowed transaction with market value         278,800,000 314,100,000  
Securities Borrowed Transactions              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Customer securities under customer margin loans agreement available to be repledged         36,000,000 4,400,000  
Securities received as collateral under securities borrowed transaction with market value         217,000,000 235,100,000  
Corporate              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Amounts pledged         142,000,000    
Other Than Corporate Customer              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Collateralized loans, collateralized by customer securities         327,400,000    
Carrying Value | Fair Value, Measurements, Nonrecurring              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Warehouse Agreement Borrowings         $ 54,300,000 $ 16,700,000  
[1] Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[2] Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.