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Financial Assets and Liabilities - Measured on a Recurring Basis (Details)
$ in Thousands
12 Months Ended
Jul. 27, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair value measurements measured on a recurring basis      
Transfers of financial assets between levels   $ 0 $ 0
Assets      
Financial instruments owned, at fair value   1,683,999 1,038,039
Financial instruments owned, pledged as collateral   143,883 259,175
Other assets   36,480 5,984
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,349,155 979,090
Equity method investment      
Payment for minority interest   38,754  
Transfer to Level 3 $ 400    
Percent interest transferred to Level 3 0.50%    
SBI      
Equity method investment      
Ownership interest (as a percent) 29.40%    
Payment for minority interest $ 38,800    
Discount rate applied to cash flow forecasts to determine initial fair value of equity method investment. 15.90%    
Market approach average price/earnings multiples of comparable companies to corroborate the income approach | item 19    
Equity securities      
Assets      
Financial instruments owned, pledged as collateral   128,202 232,731
Exchange traded notes      
Assets      
Financial instruments owned, pledged as collateral   15,681 26,444
Fair value measurements measured on a recurring basis      
Assets      
Financial instruments owned, at fair value, counterparty and cash collateral netting   (1,140,239) (785,855)
Liabilities      
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (1,009,038) (746,014)
Fair value measurements measured on a recurring basis | Currency forwards      
Assets      
Financial instruments owned, at fair value, counterparty and cash collateral netting   (1,140,239) (785,855)
Liabilities      
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (1,009,038)  
Fair value measurements measured on a recurring basis | Options      
Liabilities      
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting     (746,014)
Fair value measurements measured on a recurring basis | Total Fair Value      
Assets      
Financial instruments owned, at fair value   1,683,999 1,038,039
Financial instruments owned, pledged as collateral   143,883 259,175
Other assets   36,480 5,984
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,349,155 979,090
Fair value measurements measured on a recurring basis | Total Fair Value | Interest rate swaps      
Assets      
Financial instruments owned, at fair value     311
Liabilities      
Financial instruments sold, not yet purchased, at fair value     163
Fair value measurements measured on a recurring basis | Total Fair Value | Currency forwards      
Assets      
Financial instruments owned, at fair value   7,022 9,580
Liabilities      
Financial instruments sold, not yet purchased, at fair value     319
Fair value measurements measured on a recurring basis | Total Fair Value | Options      
Assets      
Financial instruments owned, at fair value   141 168
Liabilities      
Financial instruments sold, not yet purchased, at fair value   80  
Fair value measurements measured on a recurring basis | Total Fair Value | Equity securities      
Assets      
Financial instruments owned, at fair value   1,629,037 948,091
Financial instruments owned, pledged as collateral   128,202 232,731
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,330,331 936,851
Fair value measurements measured on a recurring basis | Total Fair Value | US and non-US government obligations      
Assets      
Financial instruments owned, at fair value   10,765 10,513
Liabilities      
Financial instruments sold, not yet purchased, at fair value     3,996
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange traded notes      
Assets      
Financial instruments owned, at fair value   37,034 69,376
Financial instruments owned, pledged as collateral   15,681 26,444
Liabilities      
Financial instruments sold, not yet purchased, at fair value   18,744  
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange stock      
Assets      
Other assets   449 5,984
Liabilities      
Financial instruments sold, not yet purchased, at fair value     37,761
Fair value measurements measured on a recurring basis | Total Fair Value | Equity investment      
Assets      
Other assets   36,031  
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets      
Financial instruments owned, at fair value   1,634,083 985,224
Financial instruments owned, pledged as collateral   143,883 259,175
Other assets   449 5,984
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,342,437 976,828
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities      
Assets      
Financial instruments owned, at fair value   1,597,049 915,848
Financial instruments owned, pledged as collateral   128,202 232,731
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,323,693 935,071
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US and non-US government obligations      
Liabilities      
Financial instruments sold, not yet purchased, at fair value     3,996
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes      
Assets      
Financial instruments owned, at fair value   37,034 69,376
Financial instruments owned, pledged as collateral   15,681 26,444
Liabilities      
Financial instruments sold, not yet purchased, at fair value   18,744  
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock      
Assets      
Other assets   449 5,984
Liabilities      
Financial instruments sold, not yet purchased, at fair value     37,761
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2)      
Assets      
Financial instruments owned, at fair value   1,190,155 838,670
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,015,756 748,276
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps      
Assets      
Financial instruments owned, at fair value     311
Liabilities      
Financial instruments sold, not yet purchased, at fair value     163
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Currency forwards      
Assets      
Financial instruments owned, at fair value   1,147,261 795,435
Liabilities      
Financial instruments sold, not yet purchased, at fair value   1,009,038 319
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options      
Assets      
Financial instruments owned, at fair value   141 168
Liabilities      
Financial instruments sold, not yet purchased, at fair value   80 746,014
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities      
Assets      
Financial instruments owned, at fair value   31,988 32,243
Liabilities      
Financial instruments sold, not yet purchased, at fair value   6,638 1,780
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | US and non-US government obligations      
Assets      
Financial instruments owned, at fair value   10,765 $ 10,513
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3)      
Assets      
Other assets   36,031  
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity investment      
Assets      
Other assets   36,031  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Purchases   38,754  
Total Realized and Unrealized Gains / (Losses)   (3,117)  
Net Transfers into (out of) Level 3   394  
Ending Balance   36,031  
Change in Net Unrealized Gains / (Losses) On Investments Held   $ (3,117)