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Financial Assets and Liabilities - Level 3 financial instruments (Details)
$ in Thousands
12 Months Ended
Jul. 27, 2017
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Jul. 27, 2016
Fair value measurements measured on a recurring basis        
Transfers of financial assets between levels   $ 0 $ 0  
Assets        
Financial instruments owned, at fair value   2,117,579 1,683,999  
Financial instruments owned, pledged as collateral   595,043 143,883  
Other assets   98,364 36,480  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   2,384,598 1,349,155  
Equity method investment        
Ownership interest (as a percent)       29.40%
Payment for minority interest     38,754  
Payment receivable   50,000    
Annual payment receivable   6,800    
Remaining additional potential payments   56,800    
Fair value of remaining additional potential payments   55,800    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   $ 36,031    
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)  
SBI        
Equity method investment        
Ownership interest (as a percent) 29.90%      
Payment for minority interest $ 38,800      
Discount rate applied to cash flow forecasts to determine initial fair value of equity method investment.   15.00%    
Market approach average price/earnings multiples of comparable companies to corroborate the income approach | item   14    
Time period of projected income to determine fair value of equity method investment   5 years    
Maximum        
Equity method investment        
Annual payment receivable   $ 6,600    
Equity securities        
Assets        
Financial instruments owned, pledged as collateral   586,251 128,202  
US and non-US government obligations        
Assets        
Financial instruments owned, pledged as collateral   99    
Exchange traded notes        
Assets        
Financial instruments owned, pledged as collateral   8,693 15,681  
Equity investment        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   36,031    
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)  
Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Purchases   3,000    
Settlement   (3,000)    
Fair value measurements measured on a recurring basis        
Assets        
Financial instruments owned, at fair value, counterparty and cash collateral netting   (2,027,697) (1,140,239)  
Liabilities        
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (2,024,991) (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   (2,027,697) (1,140,239)  
Liabilities        
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting   (2,024,991)    
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 | Fair Value        
Assets        
Financial instruments owned, at fair value   2,117,579 1,683,999  
Financial instruments owned, pledged as collateral   595,043 143,883  
Other assets   98,364 36,480  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   2,384,598 1,349,155  
Fair value measurements measured on a recurring basis | Fair Value | Interest rate swaps        
Liabilities        
Financial instruments sold, not yet purchased, at fair value     80  
Fair value measurements measured on a recurring basis | Fair Value | Currency forwards        
Assets        
Financial instruments owned, at fair value   17,790 7,022  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   7,026    
Fair value measurements measured on a recurring basis | Fair Value | Options        
Assets        
Financial instruments owned, at fair value   7,045 141  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   5,839    
Fair value measurements measured on a recurring basis | Fair Value | Equity securities        
Assets        
Financial instruments owned, at fair value   1,926,591 1,629,037  
Financial instruments owned, pledged as collateral   586,251 128,202  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   2,203,432 1,330,331  
Fair value measurements measured on a recurring basis | Fair Value | US and non-US government obligations        
Assets        
Financial instruments owned, at fair value   22,783 10,765  
Financial instruments owned, pledged as collateral   99    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   31,421    
Fair value measurements measured on a recurring basis | Fair Value | Corporate Bonds        
Assets        
Financial instruments owned, at fair value   60,975    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   81,118    
Fair value measurements measured on a recurring basis | Fair Value | Exchange traded notes        
Assets        
Financial instruments owned, at fair value   82,395 37,034  
Financial instruments owned, pledged as collateral   8,693 15,681  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   55,762    
Fair value measurements measured on a recurring basis | Fair Value | Exchange stock        
Assets        
Other assets   1,952 449  
Liabilities        
Financial instruments sold, not yet purchased, at fair value     18,744  
Fair value measurements measured on a recurring basis | Fair Value | Equity investment        
Assets        
Other assets   40,588 36,031  
Fair value measurements measured on a recurring basis | Fair Value | Other        
Assets        
Other assets   55,824    
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   785,185 1,634,083  
Financial instruments owned, pledged as collateral   410,851 143,883  
Other assets   1,952 449  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   874,109 1,342,437  
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Options        
Assets        
Financial instruments owned, at fair value   7,045    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   5,839    
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   758,596 1,597,049  
Financial instruments owned, pledged as collateral   410,670 128,202  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   847,816 1,323,693  
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US and non-US government obligations        
Assets        
Financial instruments owned, at fair value   5,968    
Financial instruments owned, pledged as collateral   99    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   18,940    
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   13,576 37,034  
Financial instruments owned, pledged as collateral   82 15,681  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,514    
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock        
Assets        
Other assets   1,952 449  
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   3,360,091 1,190,155  
Financial instruments owned, pledged as collateral   184,192    
Other assets   55,824    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   3,535,480 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   2,045,487 1,147,261  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   2,032,017    
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options        
Assets        
Financial instruments owned, at fair value     141  
Liabilities        
Financial instruments sold, not yet purchased, at fair value     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   1,167,995 31,988  
Financial instruments owned, pledged as collateral   175,581    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   1,355,616 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   16,815 10,765  
Liabilities        
Financial instruments sold, not yet purchased, at fair value   12,481    
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Bonds        
Assets        
Financial instruments owned, at fair value   60,975    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   81,118    
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Exchange traded notes        
Assets        
Financial instruments owned, at fair value   68,819    
Financial instruments owned, pledged as collateral   8,611    
Liabilities        
Financial instruments sold, not yet purchased, at fair value   54,248    
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Other        
Assets        
Other assets   55,824    
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3)        
Assets        
Other assets   40,588 36,031  
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity investment        
Assets        
Other assets   40,588 36,031  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   36,031    
Purchases   3,000    
Total Realized and Unrealized Gains / (Losses)   4,557    
Settlement   (3,000)    
Ending Balance   40,588 $ 36,031  
Change in Net Unrealized Gains / (Losses) On Investments Held   $ 4,557