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Financial Assets and Liabilities - Measured on a Recurring Basis (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 27, 2016
USD ($)
Mar. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Fair value measurements measured on a recurring basis        
Transfers of financial assets between levels   $ 0   $ 0
Assets        
Financial instruments owned, at fair value   1,630,581 $ 1,683,999  
Financial instruments owned, pledged as collateral   269,389 143,883  
Other assets   38,055 36,480  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   $ 1,673,802 1,349,155  
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   $ 264,486 128,202  
Exchange traded notes        
Assets        
Financial instruments owned, pledged as collateral   4,903 15,681  
Significant Unobservable Inputs (Level 3)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   36,031    
Total Realized and Unrealized Gains / (Losses)   1,557    
Ending Balance   37,588 36,031  
Change in Net Unrealized Gains / (Losses) On Investments Held   1,557    
Significant Unobservable Inputs (Level 3) | Equity investment        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   36,031    
Total Realized and Unrealized Gains / (Losses)   1,557    
Ending Balance   37,588 36,031  
Change in Net Unrealized Gains / (Losses) On Investments Held   1,557    
Fair value measurements measured on a recurring basis        
Assets        
Financial instruments owned, at fair value, counterparty and cash collateral netting   (1,755,123) (1,140,239)  
Liabilities        
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (1,792,466) (1,009,038)  
Fair value measurements measured on a recurring basis | Currency forwards        
Assets        
Financial instruments owned, at fair value, counterparty and cash collateral netting   (1,755,123) (1,140,239)  
Liabilities        
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (1,792,466)    
Fair value measurements measured on a recurring basis | Options        
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 | Total Fair Value        
Assets        
Financial instruments owned, at fair value   1,630,581 1,683,999  
Financial instruments owned, pledged as collateral   269,389 143,883  
Other assets   38,055 36,480  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,673,802 1,349,155  
Fair value measurements measured on a recurring basis | Total Fair Value | Interest rate swaps        
Liabilities        
Financial instruments sold, not yet purchased, at fair value     80  
Fair value measurements measured on a recurring basis | Total Fair Value | Currency forwards        
Assets        
Financial instruments owned, at fair value   1,056 7,022  
Fair value measurements measured on a recurring basis | Total Fair Value | Options        
Assets        
Financial instruments owned, at fair value   266 141  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   228    
Fair value measurements measured on a recurring basis | Total Fair Value | Equity securities        
Assets        
Financial instruments owned, at fair value   1,598,068 1,629,037  
Financial instruments owned, pledged as collateral   264,486 128,202  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,618,670 1,330,331  
Fair value measurements measured on a recurring basis | Total Fair Value | US and non-US government obligations        
Assets        
Financial instruments owned, at fair value   9,007 10,765  
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange traded notes        
Assets        
Financial instruments owned, at fair value   22,184 37,034  
Financial instruments owned, pledged as collateral   4,903 15,681  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   54,904    
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange stock        
Assets        
Other assets   467 449  
Liabilities        
Financial instruments sold, not yet purchased, at fair value     18,744  
Fair value measurements measured on a recurring basis | Total Fair Value | Equity investment        
Assets        
Other assets   37,588 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   185,084 1,634,083  
Financial instruments owned, pledged as collateral   32,168 143,883  
Other assets   467 449  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   604,260 1,342,437  
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   184,003 1,597,049  
Financial instruments owned, pledged as collateral   32,168 128,202  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   604,260 1,323,693  
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   1,081 37,034  
Financial instruments owned, pledged as collateral     15,681  
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock        
Assets        
Other assets   467 449  
Liabilities        
Financial instruments sold, not yet purchased, at fair value     18,744  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2)        
Assets        
Financial instruments owned, at fair value   3,200,620 1,190,155  
Financial instruments owned, pledged as collateral   237,221    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   2,862,008 1,015,756  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps        
Liabilities        
Financial instruments sold, not yet purchased, at fair value     80  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Currency forwards        
Assets        
Financial instruments owned, at fair value   1,756,179 1,147,261  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,792,466    
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options        
Assets        
Financial instruments owned, at fair value   266 141  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   228 1,009,038  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities        
Assets        
Financial instruments owned, at fair value   1,414,065 31,988  
Financial instruments owned, pledged as collateral   232,318    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,014,410 6,638  
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   9,007 10,765  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Exchange traded notes        
Assets        
Financial instruments owned, at fair value   21,103    
Financial instruments owned, pledged as collateral   4,903    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   54,904    
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3)        
Assets        
Other assets   37,588 36,031  
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity investment        
Assets        
Other assets   $ 37,588 $ 36,031