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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Equities futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives Assets
Fair Value	$ 4,669	$ (1,366)
Notional	2,208,899	4,502,017
Equities futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives Liabilities
Fair Value	31	751
Notional	90,219	83,803
Commodity futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives Assets
Fair Value	173,889	40,656
Notional	6,237,389	7,758,974
Commodity futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives Liabilities
Fair Value	(5,397)	(45,175)
Notional	27,287	3,604,979
Currency futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives Assets
Fair Value	(11,736)	(2,860)
Notional	2,823,277	1,116,246
Currency futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives Liabilities
Fair Value	3,598	(23,223)
Notional	2,269,898	6,594,991
Fixed income futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives Assets
Fair Value	42	47
Notional	102,476	155,697
Fixed income futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives Liabilities
Fair Value	0	94
Notional	1,566	190,938
Options
Derivatives Assets
Fair Value	9,080	8,538
Derivatives Liabilities
Fair Value	9,241	3,087
Options | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives Assets
Fair Value	9,080	8,538
Notional	746,723	442,808
Options | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives Liabilities
Fair Value	9,241	3,087
Notional	736,997	436,422
Currency forwards
Derivatives Assets
Fair Value	341,360	242,552
Derivatives Liabilities
Fair Value	292,965	196,554
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives Assets
Fair Value	341,360	242,552
Notional	30,596,681	24,369,818
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives Liabilities
Fair Value	292,965	196,554
Notional	30,572,490	24,346,818
Interest rate swap
Derivatives Liabilities
Fair Value	63,513
Interest rate swap | Derivative instruments not designated as hedging instruments | Other assets
Derivatives Assets
Fair Value	0	8,976
Notional	0	525,000
Interest rate swap | Derivative instruments designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives Liabilities
Fair Value	63,513	0
Notional	$ 1,525,000	$ 0

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- Definition

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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