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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]            
General partner administrative fee monthly (in hundredths)       0.1667%dwsf_GeneralPartnerAdministrativeFeeRateMonthly    
Annualized general partner administrative fee (in hundredths) 2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage     2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage    
Monthly ongoing placement agent fee (in hundredths)       0.1667%dwsf_MonthlyPlacementAgentFeePercentage    
Annualized ongoing placement agent fee (in hundredths) 2.00%dwsf_AnnualizedPlacementAgentFeePercentage     2.00%dwsf_AnnualizedPlacementAgentFeePercentage    
Annualized flat rate brokerage fee (in hundredths) 4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage 6.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage 4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage      
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member]            
Schedule of Equity Method Investments [Line Items]            
Percentage basis of funds on deposit for interest income recognition (in hundredths)       100.00%dwsf_PartnershipDepositFundPercentageBasisForInterestIncomeRecognition
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Partnership assets percentage not deposited as margin credit for interest income (in hundredths)       80.00%dwsf_PartnershipAssetsPercentageNotDepositedAsMarginCreditForInterestIncome
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
General partner administrative fee monthly (in hundredths)       0.133%dwsf_GeneralPartnerAdministrativeFeeRateMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Annualized general partner administrative fee (in hundredths) 1.60%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
    1.60%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Monthly ongoing placement agent fee (in hundredths)       0.1667%dwsf_MonthlyPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Annualized ongoing placement agent fee (in hundredths) 2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
    2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Annualized flat rate brokerage fee (in hundredths) 3.60%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
      4.60%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
 
Limited partners unit that can be redeemed (in hundredths) 100.00%dwsf_LimitedPartnersUnitThatCanBeRedeemed
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
  100.00%dwsf_LimitedPartnersUnitThatCanBeRedeemed
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
100.00%dwsf_LimitedPartnersUnitThatCanBeRedeemed
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Whole Units required per redemption (in units)       50dwsf_UnitsOfPartnershipInterestRedemptionAmountRequired
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Distributions       0us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Provision for income taxes       0us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
   
Unrecognized tax benefit 0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
  0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
  $ 0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member]            
Schedule of Equity Method Investments [Line Items]            
General partner administrative fee monthly (in hundredths)       0.1667%dwsf_GeneralPartnerAdministrativeFeeRateMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
   
Annualized general partner administrative fee (in hundredths) 2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
    2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
   
Monthly ongoing placement agent fee (in hundredths)       0.1667%dwsf_MonthlyPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
   
Annualized ongoing placement agent fee (in hundredths) 2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
    2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
   
Annualized flat rate brokerage fee (in hundredths) 4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
6.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
     
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member]            
Schedule of Equity Method Investments [Line Items]            
General partner administrative fee monthly (in hundredths)       0.1667%dwsf_GeneralPartnerAdministrativeFeeRateMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
   
Annualized general partner administrative fee (in hundredths) 2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
    2.00%dwsf_AnnualizedGeneralPartnerAdministrativeFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
   
Monthly ongoing placement agent fee (in hundredths)       0.1667%dwsf_MonthlyPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
   
Annualized ongoing placement agent fee (in hundredths) 2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
    2.00%dwsf_AnnualizedPlacementAgentFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
   
Annualized flat rate brokerage fee (in hundredths) 4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
6.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
4.00%dwsf_AnnualizedFlatRateBrokerageFeePercentage
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember