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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities borrowed    
Gross Amounts of Recognized Assets $ 1,232,048 $ 1,471,172
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 1,232,048 1,471,172
Gross Amounts Not Offset in the Statement of Financial Condition    
Financial instruments (1,202,760) (1,418,672)
Cash collateral received (2,624) (13,318)
Net Amount 26,664 39,182
Securities purchased under agreements to resell    
Gross Amounts of Recognized Assets 602  
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition 602 0
Gross Amounts Not Offset In the Statement of Financial Condition    
Financial Instruments (602)  
Cash Collateral Received 0  
Net Amount 0  
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Securities Loaned, Collateral, Right to Reclaim Cash 884 10,776
Total    
Gross Amounts of Recognized Assets 1,944,749 3,523,704
Gross Amounts Offset in the Consolidated Statement of Financial Condition (700,655) (2,027,697)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 1,244,094 1,496,007
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (1,203,363) (1,418,717)
Cash collateral received (2,624) (13,318)
Net Amount 38,107 63,972
Currency forwards    
Trading assets, at fair value    
Gross Amounts of Recognized Assets 702,889 2,045,487
Gross Amounts Offset in the Consolidated Statement of Financial Condition (700,655) (2,027,697)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 2,234 17,790
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments 0 0
Cash collateral received 0 0
Net Amount 2,234 17,790
Options    
Trading assets, at fair value    
Gross Amounts of Recognized Assets 9,210 7,045
Gross Amounts Offset in the Consolidated Statement of Financial Condition 0 0
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 9,210 7,045
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (1) (45)
Cash collateral received 0 0
Net Amount $ 9,209 $ 7,000