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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Equities futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | $ 2,950 | $ (15,382)
Derivatives Assets, Notional | 2,523 | 2,891,606
Equities futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 181 | 468
Derivatives Liabilities, Notional | 165,238 | 106,487
Commodity futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 6,660 | 69,235
Derivatives Assets, Notional | 9,712,453 | 11,595,215
Commodity futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 1,872 | (375)
Derivatives Liabilities, Notional | 4,674,521 | 54,782
Currency futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 4,185 | (9,432)
Derivatives Assets, Notional | 2,855,717 | 3,756,914
Currency futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 4,911 | (30,643)
Derivatives Liabilities, Notional | 2,554,681 | 6,239,725
Fixed income futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 2 | (28)
Derivatives Assets, Notional | 6,888 | 18,694
Fixed income futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 0 | 93
Derivatives Liabilities, Notional | 0 | 8,591
Options |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 3,914 | 11,899
Derivatives Liabilities, Fair Value | 4,359 | 11,051
Options | Derivative instruments not designated as hedging instruments | Financial instruments owned |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 3,914 | 11,899
Derivatives Assets, Notional | 435,244 | 659,101
Options | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 4,359 | 11,051
Derivatives Liabilities, Notional | 459,274 | 608,756
Currency forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 1,212,911 | 2,792,373
Derivatives Liabilities, Fair Value | 1,219,684 | 2,720,749
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments owned |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets, Fair Value | 1,212,911 | 2,792,373
Derivatives Assets, Notional | 134,607,800 | 171,288,432
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 1,219,684 | 2,720,749
Derivatives Liabilities, Notional | 134,611,187 | 171,252,224
Currency forwards | Derivative instruments designated as hedging instruments | Financial instruments sold, not yet purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liabilities, Fair Value | 0 | (792)
Derivatives Liabilities, Notional | $ 0 | $ 13,501

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