Derivatives and Hedging - Schedule of Effect of Trading Activities on Statement of Financial Condition (Detail) - Futures and Forward Contracts [Member]	Sep. 30, 2015 USD ($) Contracts	Dec. 31, 2014 USD ($) Contracts
Derivative [Line Items]
Net unrealized gain (loss) on open contracts	$ 342,570	$ 1,293,243
Commodity [Member]
Derivative [Line Items]
Net unrealized gain (loss) on open contracts	$ 186,476	$ 152,349
Average number of contracts outstanding | Contracts	693	848
Equity [Member]
Derivative [Line Items]
Net unrealized gain (loss) on open contracts	$ (42,744)	$ 4,149
Average number of contracts outstanding | Contracts	185	309
Foreign Currency [Member]
Derivative [Line Items]
Net unrealized gain (loss) on open contracts	$ 23,790	$ 518,669
Average number of contracts outstanding | Contracts	281	429
Interest Rate [Member]
Derivative [Line Items]
Net unrealized gain (loss) on open contracts	$ 175,048	$ 618,076
Average number of contracts outstanding | Contracts	574	977
Long [Member]
Derivative [Line Items]
Unrealized Gain	$ 335,013	$ 751,668
Unrealized Loss	(780,968)	(958,824)
Long [Member] | Commodity [Member]
Derivative [Line Items]
Unrealized Gain	56,886	3,667
Unrealized Loss	(88,877)	(117,406)
Long [Member] | Equity [Member]
Derivative [Line Items]
Unrealized Gain	6,344	53,954
Unrealized Loss	(51,759)	(46,233)
Long [Member] | Foreign Currency [Member]
Derivative [Line Items]
Unrealized Gain	85,744	68,076
Unrealized Loss	(635,471)	(785,527)
Long [Member] | Interest Rate [Member]
Derivative [Line Items]
Unrealized Gain	186,039	625,971
Unrealized Loss	(4,861)	(9,658)
Short [Member]
Derivative [Line Items]
Unrealized Gain	1,058,455	1,657,678
Unrealized Loss	(269,930)	(157,279)
Short [Member] | Commodity [Member]
Derivative [Line Items]
Unrealized Gain	335,671	290,455
Unrealized Loss	(117,204)	(24,367)
Short [Member] | Equity [Member]
Derivative [Line Items]
Unrealized Gain	14,146	689
Unrealized Loss	(11,475)	(4,261)
Short [Member] | Foreign Currency [Member]
Derivative [Line Items]
Unrealized Gain	708,310	1,356,424
Unrealized Loss	(134,793)	(120,304)
Short [Member] | Interest Rate [Member]
Derivative [Line Items]
Unrealized Gain	328	10,110
Unrealized Loss	$ (6,458)	$ (8,347)