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Condensed Schedule of Investments (USD $)
Mar. 31, 2015
Dec. 31, 2014
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts $ 2,020,480us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet $ 5,792,535us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
Unrealized Currency Loss (790,401)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss (669,947)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
Net fair value 2,020,480us-gaap_InvestmentOwnedAtFairValue 5,792,535us-gaap_InvestmentOwnedAtFairValue
Unrealized Currency Loss Percentage of Partners' Capital (in hundredths) (0.66%)dwsf_UnrealizedCurrencyGainLossPercentageOfPartnersCapital (0.57%)dwsf_UnrealizedCurrencyGainLossPercentageOfPartnersCapital
Fair value Percentage of Partners' Capital (in hundredths) 1.68%dwsf_FairValuePercentageOfPartnersCapital 4.91%dwsf_FairValuePercentageOfPartnersCapital
Futures and Forward Contracts [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 2,020,480us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
5,792,535us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
Unrealized Currency Loss (790,401)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
(669,947)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
Long [Member] | Futures and Forward Contracts [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 1,283,909us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
1,307,965us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Percentage of Partners' Capital (in hundredths) 1.07%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
1.11%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Long [Member] | Futures and Forward Contracts [Member] | Commodity [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts (389,820)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
(1,909,532)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Percentage of Partners' Capital (in hundredths) (0.32%)us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
(1.62%)us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Long [Member] | Futures and Forward Contracts [Member] | Equity [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 510,228us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
236,709us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Percentage of Partners' Capital (in hundredths) 0.42%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
0.20%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Long [Member] | Futures and Forward Contracts [Member] | Foreign Currency [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts (344,274)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
52,035us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Percentage of Partners' Capital (in hundredths) (0.29%)us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
0.04%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Long [Member] | Futures and Forward Contracts [Member] | Interest Rate [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 1,507,775us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
2,928,753us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Percentage of Partners' Capital (in hundredths) 1.26%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
2.48%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Short [Member] | Futures and Forward Contracts [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 1,526,972us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
5,154,517us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Percentage of Partners' Capital (in hundredths) 1.27%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
4.37%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Short [Member] | Futures and Forward Contracts [Member] | Commodity [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts 1,886,767us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
4,259,593us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Percentage of Partners' Capital (in hundredths) 1.57%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
3.61%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Short [Member] | Futures and Forward Contracts [Member] | Equity [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts (1,265)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
(97,922)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Percentage of Partners' Capital (in hundredths)   (0.08%)us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Short [Member] | Futures and Forward Contracts [Member] | Foreign Currency [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts (362,993)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
991,501us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Percentage of Partners' Capital (in hundredths) (0.30%)us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
0.84%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Short [Member] | Futures and Forward Contracts [Member] | Interest Rate [Member]    
Investment Holdings [Line Items]    
Net unrealized gain/(loss) on open contracts $ 4,463us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
$ 1,345us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ us-gaap_DerivativeByNatureAxis
= dwsf_FuturesAndForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember