Trading Activities - Gross Fair Values of Derivative Instruments of Futures and Forward Contracts Traded (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Futures Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	$ 3,839,879	$ 3,831,162
Total unrealized appreciation on open contracts	(1,220,754)	(2,431,726)
Net unrealized appreciation (depreciation) on open contracts	2,619,125	1,399,436
Futures Contracts [Member] \| Commodity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	1,082,519	2,019,400
Total unrealized appreciation on open contracts	(588,230)	(937,844)
Futures Contracts [Member] \| Equity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	358,731	196,959
Total unrealized appreciation on open contracts	(307,292)	(421,360)
Futures Contracts [Member] \| Foreign Currency [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	113,861	1,206,216
Total unrealized appreciation on open contracts	(78,860)	(469,882)
Futures Contracts [Member] \| Interest Rate [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	2,284,768	408,587
Total unrealized appreciation on open contracts	(246,372)	(602,640)
Forward Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	2,096,970	1,168,919
Total unrealized appreciation on open contracts	(2,434,951)	(1,125,088)
Net unrealized appreciation (depreciation) on open contracts	(337,981)	43,831
Forward Contracts [Member] \| Commodity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	640,314	740,942
Total unrealized appreciation on open contracts	(1,469,694)	(954,788)
Forward Contracts [Member] \| Foreign Currency [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total unrealized appreciation on open contracts	1,456,656	427,977
Total unrealized appreciation on open contracts	$ (965,257)	$ (170,300)

This element represents the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=50485924&loc=SL6090603-123010

+ Details

Name:	us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity.

+ References

+ Details

Name:	us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

+ References

+ Details

Name:	us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_TradingActivityGainsAndLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FutureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TradingActivityByTypeAxis=us-gaap_CommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TradingActivityByTypeAxis=us-gaap_EquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TradingActivityByTypeAxis=us-gaap_ForeignExchangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TradingActivityByTypeAxis=us-gaap_FixedIncomeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: