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Derivatives and Hedging, Offsetting Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized $ (3,112,070)us-gaap_DerivativeFairValueOfDerivativeLiability $ (3,080,139)us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Statement of Financial Condition 3,112,070us-gaap_DerivativeLiabilityFairValueGrossAsset 3,080,139us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Amounts Presented in the Statement of Financial Condition 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Unrealized currency loss (669,947)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss (689,577)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
Total net unrealized gain on open contracts 5,792,535us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet 6,652,432us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
Future Contract [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized (1,519,724)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember		 (3,011,012)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
Gross Amounts Offset in the Statement of Financial Condition 1,519,724us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember		 3,011,012us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
Net Amounts Presented in the Statement of Financial Condition 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember		 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
Forward Contracts [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized (1,592,346)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 (69,127)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Gross Amounts Offset in the Statement of Financial Condition 1,592,346us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 69,127us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Net Amounts Presented in the Statement of Financial Condition 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Unrealized currency loss   0dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
Total net unrealized gain on open contracts   0us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized (2,474,987)us-gaap_DerivativeFairValueOfDerivativeLiability
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 (1,460,038)us-gaap_DerivativeFairValueOfDerivativeLiability
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Gross Amounts Offset in the Statement of Financial Condition 2,474,987us-gaap_DerivativeLiabilityFairValueGrossAsset
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 1,460,038us-gaap_DerivativeLiabilityFairValueGrossAsset
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Net Amounts Presented in the Statement of Financial Condition 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Unrealized currency loss (3,465,597)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 (3,447,831)dwsf_InvestmentOwnedUnrealizedCurrencyGainLoss
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Total net unrealized gain on open contracts 604,870us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 1,225,590us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Future Contract [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized (797,767)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 (1,139,524)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Gross Amounts Offset in the Statement of Financial Condition 797,767us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 1,139,524us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Net Amounts Presented in the Statement of Financial Condition 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Forward Contracts [Member]    
Offsetting of Derivative Liabilities [Line Items]    
Gross Amounts Recognized (1,677,220)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 (320,514)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Gross Amounts Offset in the Statement of Financial Condition 1,677,220us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 320,514us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
Net Amounts Presented in the Statement of Financial Condition $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember