Derivative Instruments Disclosures (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	$ 12,066,277	$ 37,958,108
Net unrealized loss on open forward currency contracts	4,458,030	695,075
Not Designated as Hedging Instrument [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	12,066,277	37,958,108
Net unrealized loss on open forward currency contracts	4,458,030	695,075
Not Designated as Hedging Instrument [Member] | Agricultural commodities [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	7,490,261	3,917,392
Not Designated as Hedging Instrument [Member] | Currencies [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	701,295	7,685,850
Not Designated as Hedging Instrument [Member] | Energy [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(526,492)	20,225
Not Designated as Hedging Instrument [Member] | Equity indices [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	4,430,717	24,865,636
Not Designated as Hedging Instrument [Member] | Interest rate instruments [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(2,353)	(371,225)
Not Designated as Hedging Instrument [Member] | Metals [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(189,513)	1,291,681
Not Designated as Hedging Instrument [Member] | Single stock futures [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	162,362	548,549
Not Designated as Hedging Instrument [Member] | Liabilities [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(20,169,740)	(20,153,978)
Net unrealized loss on open forward currency contracts	(5,798,442)	(5,123,113)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Agricultural commodities [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(1,226,807)	(1,905,881)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Currencies [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(2,307,152)	(793,925)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Energy [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(1,651,268)	(1,941,715)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Equity indices [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(2,297,858)	(391,244)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Interest rate instruments [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(4,424,771)	(5,895,183)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Metals [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(7,990,787)	(9,156,794)
Not Designated as Hedging Instrument [Member] | Liabilities [Member] | Single stock futures [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	(271,097)	(69,236)
Not Designated as Hedging Instrument [Member] | Assets [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	32,236,017	58,112,086
Net unrealized loss on open forward currency contracts	10,256,472	5,818,188
Not Designated as Hedging Instrument [Member] | Assets [Member] | Agricultural commodities [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	8,717,068	5,823,273
Not Designated as Hedging Instrument [Member] | Assets [Member] | Currencies [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	3,008,447	8,479,775
Not Designated as Hedging Instrument [Member] | Assets [Member] | Energy [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	1,124,776	1,961,940
Not Designated as Hedging Instrument [Member] | Assets [Member] | Equity indices [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	6,728,575	25,256,880
Not Designated as Hedging Instrument [Member] | Assets [Member] | Interest rate instruments [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	4,422,418	5,523,958
Not Designated as Hedging Instrument [Member] | Assets [Member] | Metals [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	7,801,274	10,448,475
Not Designated as Hedging Instrument [Member] | Assets [Member] | Single stock futures [Member]
Equity in broker trading accounts:
Net unrealized gain on open futures contracts	$ 433,459	$ 617,785