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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Fair value measurements measured on a recurring basis      
Transfers of financial assets between levels $ 0   $ 0
Assets      
Financial instruments owned, at fair value 1,276,022 $ 1,038,039  
Financial instruments owned, pledged as collateral 247,652 259,175  
Other assets: exchange stock 6,250 5,984  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,411,609 979,090  
Equity securities      
Assets      
Financial instruments owned, pledged as collateral 244,868 232,731  
Exchange traded notes      
Assets      
Financial instruments owned, pledged as collateral 2,784 26,444  
Fair value measurements measured on a recurring basis | Total Fair Value      
Assets      
Financial instruments owned, at fair value 1,276,022 1,038,039  
Financial instruments owned, pledged as collateral 247,652 259,175  
Other assets: exchange stock 6,250 5,984  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,411,609 979,090  
Fair value measurements measured on a recurring basis | Total Fair Value | Interest rate swaps      
Assets      
Financial instruments owned, at fair value 351 311  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 357 163  
Fair value measurements measured on a recurring basis | Total Fair Value | Currency forwards      
Assets      
Financial instruments owned, at fair value 3,047 9,580  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 5,088 319  
Fair value measurements measured on a recurring basis | Total Fair Value | Options      
Assets      
Financial instruments owned, at fair value 220 168  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 211    
Fair value measurements measured on a recurring basis | Total Fair Value | Equity securities      
Assets      
Financial instruments owned, at fair value 1,224,827 948,091  
Financial instruments owned, pledged as collateral 244,868 232,731  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,375,346 936,851  
Fair value measurements measured on a recurring basis | Total Fair Value | US and non-US government obligations      
Assets      
Financial instruments owned, at fair value 8,238 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 39,339 69,376  
Financial instruments owned, pledged as collateral 2,784 26,444  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 30,607    
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange stock      
Assets      
Other assets: exchange stock 6,250 5,984  
Liabilities      
Financial instruments sold, not yet purchased, at fair value   37,761  
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 1,227,129 985,224  
Financial instruments owned, pledged as collateral 247,652 259,175  
Other assets: exchange stock 6,250 5,984  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,401,564 976,828  
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 1,187,790 915,848  
Financial instruments owned, pledged as collateral 244,868 232,731  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,370,957 935,071  
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 39,339 69,376  
Financial instruments owned, pledged as collateral 2,784 26,444  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 30,607    
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock      
Assets      
Other assets: exchange stock 6,250 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 1,444,566 838,670  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,462,924 748,276  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps      
Assets      
Financial instruments owned, at fair value 351 311  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 357 163  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Currency forwards      
Assets      
Financial instruments owned, at fair value 1,398,720 795,435  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 1,457,967 319  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options      
Assets      
Financial instruments owned, at fair value 220 168  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 211 746,014  
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities      
Assets      
Financial instruments owned, at fair value 37,037 32,243  
Liabilities      
Financial instruments sold, not yet purchased, at fair value 4,389 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 8,238 10,513  
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting      
Assets      
Financial instruments owned, at fair value (1,395,673) (785,855)  
Liabilities      
Financial instruments sold, not yet purchased, at fair value (1,452,879) (746,014)  
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting | Currency forwards      
Assets      
Financial instruments owned, at fair value (1,395,673) (785,855)  
Liabilities      
Financial instruments sold, not yet purchased, at fair value $ (1,452,879)    
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting | Options      
Liabilities      
Financial instruments sold, not yet purchased, at fair value   $ (746,014)