Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Instruments) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives Fair Value	$ 2,783,634	$ 963,771
Liability Derivatives Fair Value	(2,723,811)	(858,769)
Net Fair Value	59,823	104,942
Agriculture [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	2,634,453	678,316
Liability Derivatives Fair Value	(2,567,518)	(369,972)
Net Fair Value	66,935	308,344
Currency [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	15,272	94,041
Liability Derivatives Fair Value	(42,940)	(185,622)
Net Fair Value	(9,668)	(91,581)
Energy [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	17,494	76,522
Liability Derivatives Fair Value	(66,420)	(202,853)
Net Fair Value	(48,926)	(126,331)
Indices [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	48,180	60,504
Liability Derivatives Fair Value	(22,120)	(55,851)
Net Fair Value	26,060	4,653
Interest Rates [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	42,661	30,579
Liability Derivatives Fair Value	(21,685)	(20,778)
Net Fair Value	20,976	9,801
Metals [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	25,574	23,749
Liability Derivatives Fair Value	(21,128)	(23,693)
Net Fair Value	$ 4,446	$ 56