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Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Securities loaned    
Gross Amounts of Recognized Liabilities $ 690,672 $ 524,603
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition 690,672 524,603
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (685,313) (521,407)
Net Amount 5,359 3,196
Total    
Gross Amounts of Recognized Liabilities 2,149,207 1,271,099
Gross Amounts Offset in the Consolidated Statement of Financial Condition (1,452,879) (746,014)
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition 696,328 525,085
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (685,874) (521,857)
Cash collateral received (7) (32)
Net Amount 10,447 3,196
Receivables from broker dealers and clearing organizations | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Net variation margin on long and short futures contracts 39,000 (8,100)
Payables to broker dealers and clearing organizations | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Net variation margin on long and short futures contracts 102,000 46,400
Currency forwards    
Trading liabilities, at fair value:    
Gross Amounts of Recognized Assets 1,457,967 746,014
Gross Amounts Offset in the Consolidated Statement of Financial Condition (1,452,879) (746,014)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 5,088  
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Net Amount 5,088  
Options    
Trading liabilities, at fair value:    
Gross Amounts of Recognized Assets 211 163
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 211 163
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (210) (139)
Cash collateral received (1) (24)
Interest rate swaps    
Trading liabilities, at fair value:    
Gross Amounts of Recognized Assets 357 319
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 357 319
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (351) (311)
Cash collateral received $ (6) $ (8)