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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, 2017
Dec. 31, 2016
Securities loaned    
Gross Amounts of Recognized Liabilities $ 423,672 $ 222,203
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition 423,672 222,203
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (423,408) (221,792)
Net Amount 264 411
Total    
Gross Amounts of Recognized Liabilities 2,216,366 1,231,321
Gross Amounts Offset in the Consolidated Statement of Financial Condition (1,792,466) (1,009,038)
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition 423,900 222,283
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (423,622) (221,872)
Net Amount 278 411
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 (10,400) 18,000
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 (4,700) (3,500)
Currency forwards    
Trading liabilities, at fair value:    
Gross Amounts of Recognized Liabilities 1,792,466 1,009,038
Gross Amounts Offset in the Consolidated Statement of Financial Condition (1,792,466) (1,009,038)
Options    
Trading liabilities, at fair value:    
Gross Amounts of Recognized Liabilities 228 80
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 228 80
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (214) $ (80)
Net Amount $ 14