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Statements of Financial Condition (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
LIABILITIES AND PARTNERS' CAPITAL    
Limited Partners, Units (in units) 3,861,976.161us-gaap_LimitedPartnersCapitalAccountUnitsIssued 5,462,815.917us-gaap_LimitedPartnersCapitalAccountUnitsIssued
General Partner, Units (in units) 43,497.666us-gaap_GeneralPartnersCapitalAccountUnitsIssued 70,819.769us-gaap_GeneralPartnersCapitalAccountUnitsIssued
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member]    
LIABILITIES AND PARTNERS' CAPITAL    
Limited Partners, Units (in units) 1,604,009.847us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember		 2,394,803.341us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
General Partner, Units (in units) 17,219.120us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember		 35,877.343us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member]    
ASSETS    
Investments, cost 7,147,767dwsf_InvestmentsOwnedCost
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember		 7,622,350dwsf_InvestmentsOwnedCost
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
LIABILITIES AND PARTNERS' CAPITAL    
Limited Partners, Units (in units) 2,592,477.838us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember		 3,829,652.114us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
General Partner, Units (in units) 29,333.202us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember		 50,919.274us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member]    
LIABILITIES AND PARTNERS' CAPITAL    
Limited Partners, Units (in units) 5,670,382.719us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 8,052,816.352us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
General Partner, Units (in units) 64,142.656us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember		 100,585.879us-gaap_GeneralPartnersCapitalAccountUnitsIssued
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember