Derivative Instruments (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Fair Values of Derivative Instruments
Asset Derivatives	$ 25,152,218	$ 24,588,435
Liability Derivatives	(20,608,233)	(20,907,216)
Fair Value	4,543,985	3,681,219
Agricultural contracts
Fair Values of Derivative Instruments
Asset Derivatives	1,530,399	1,010,073
Liability Derivatives	(1,158,760)	(846,892)
Fair Value	371,639	163,181
Currencies contracts
Fair Values of Derivative Instruments
Asset Derivatives	6,101,506	12,045,469
Liability Derivatives	(5,096,404)	(7,703,776)
Fair Value	1,005,102	4,341,693
Energy contracts
Fair Values of Derivative Instruments
Asset Derivatives	723,192	1,028,505
Liability Derivatives	(1,113,068)	(400,364)
Fair Value	(389,876)	628,141
Interest rates contracts
Fair Values of Derivative Instruments
Asset Derivatives	2,542,602	2,816,093
Liability Derivatives	(2,084,372)	(2,237,432)
Fair Value	458,230	578,661
Meats contracts
Fair Values of Derivative Instruments
Asset Derivatives	161,464	11,264
Liability Derivatives	(92,240)	(73,450)
Fair Value	69,224	(62,186)
Metals contracts
Fair Values of Derivative Instruments
Asset Derivatives	12,909,763	4,252,379
Liability Derivatives	(7,895,353)	(6,777,973)
Fair Value	5,014,410	(2,525,594)
Soft commodities contracts
Fair Values of Derivative Instruments
Asset Derivatives	263,079	745,230
Liability Derivatives	(328,655)	(333,162)
Fair Value	(65,576)	412,068
Stock indices contracts
Fair Values of Derivative Instruments
Asset Derivatives	920,213	2,679,422
Liability Derivatives	(2,839,381)	(2,534,167)
Fair Value	$ (1,919,168)	$ 145,255