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Trading Advisors (Details)
 12 Months Ended 7 Months Ended 11 Months Ended 6 Months Ended 5 Months Ended 9 Months Ended 2 Months Ended 10 Months Ended 5 Months Ended 4 Months Ended 5 Months Ended 7 Months Ended 5 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2014
Aug. 07, 2014
Nov. 30, 2013
Jun. 27, 2013
May 30, 2013
Sep. 30, 2013
Oct. 09, 2012
Feb. 28, 2014
Dec. 31, 2014
May 31, 2012
May 31, 2014
May 31, 2014
Dec. 31, 2014
Oct. 30, 2012
Oct. 30, 2012
Dec. 31, 2011
Altis [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Altis Partners (Jersey) Limited                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1042%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_AltisPartnersJerseyLimitedMember		                              
Management fee, annual basis (in hundredths) 1.25%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_AltisPartnersJerseyLimitedMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_AltisPartnersJerseyLimitedMember		                              
EMC [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name EMC Capital Advisors, LLC                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1667%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_EmcCapitalManagementIncMember		                              
Management fee, annual basis (in hundredths) 2.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_EmcCapitalManagementIncMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_EmcCapitalManagementIncMember		                              
Graham [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Graham Capital Management, L.P. ("Graham")                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1667%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_GrahamCapitalManagementLPMember		                              
Management fee, annual basis (in hundredths) 2.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_GrahamCapitalManagementLPMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_GrahamCapitalManagementLPMember		                              
Northfield [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0833%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		 0.0833%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		 0.1667%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		                          
Management fee, annual basis (in hundredths) 1.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		 1.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		 2.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		                          
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)   20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_NorthfieldTradingLPMember		                            
Rabar [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Rabar Market Research, Inc. ("Rabar")                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1667%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_RabarMarketResearchIncMember		                              
Management fee, annual basis (in hundredths) 2.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_RabarMarketResearchIncMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_RabarMarketResearchIncMember		                              
Sunrise Capital [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths)       0.1667%dwsf_ManagementFeePercentageMonthly
/ dwsf_TradingAdvisorAxis
= dwsf_SunriseCapitalManagementIncMember		                        
Management fee, annual basis (in hundredths)       2.00%dwsf_ManagementFeePercentageAnnualized
/ dwsf_TradingAdvisorAxis
= dwsf_SunriseCapitalManagementIncMember		                        
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)       20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dwsf_TradingAdvisorAxis
= dwsf_SunriseCapitalManagementIncMember		                        
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | C-View [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths)         0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CViewInternationalLimitedMember		                      
Management fee, annual basis (in hundredths)         2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CViewInternationalLimitedMember		                      
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)         20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CViewInternationalLimitedMember		                      
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | Krom River [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0833%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_KromRiverTradingAgMember		         0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_KromRiverTradingAgMember		                    
Management fee, annual basis (in hundredths) 1.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_KromRiverTradingAgMember		         2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_KromRiverTradingAgMember		                    
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_KromRiverTradingAgMember		                              
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | Cambridge [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Cambridge                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CambridgeMember		                              
Management fee, annual basis (in hundredths) 1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CambridgeMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 15.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CambridgeMember		                              
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | Flintlock [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths)             0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_FlintlockMember		                  
Management fee, annual basis (in hundredths)             1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_FlintlockMember		                  
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)             20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumCurrencyAndCommodityLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_FlintlockMember		                  
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | Aventis [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Aventis                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1042%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		             0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		 0.1042%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		              
Management fee, annual basis (in hundredths) 1.25%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		             1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		 1.25%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AventisAssetManagementLlcMember		                              
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | Blenheim [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Blenheim                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		             0.25%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		              
Management fee, annual basis (in hundredths) 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		             3.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		             15.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlenheimCapitalManagementLLCMember		                
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | PGR [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name PGR Capital L.P.                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0833%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_PgrCapitalLPMember		                              
Management fee, annual basis (in hundredths) 1.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_PgrCapitalLPMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_PgrCapitalLPMember		                              
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | Blackwater [Member]                                
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)                 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumStrategicLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		              
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Aspect [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Aspect Capital Limited (“Aspect”)                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AspectCapitalLimitedMember		                 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AspectCapitalLimitedMember		            
Management fee, annual basis (in hundredths) 1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AspectCapitalLimitedMember		                 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AspectCapitalLimitedMember		            
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_AspectCapitalLimitedMember		                              
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Blackwater [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Blackwater Capital Management LLC                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0625%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		   0.1042%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		                          
Management fee, annual basis (in hundredths) 0.75%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		   1.25%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		                          
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_BlackwaterCapitalManagementLlcMember		                              
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Campbell [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Campbell                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		                   0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		 0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		      
Management fee, annual basis (in hundredths) 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		                   2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		 1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		      
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_CampbellAndCompanyIncMember		                              
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Chesapeake [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0833%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		                 0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		         0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		  
Management fee, annual basis (in hundredths) 1.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		                 2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		         2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		  
Temporarily reduced management fee, annual basis (in hundredths)                           1.00%dwsf_ManagementFeeRateTemporaryReduction
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		    
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)                             19.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_ChesapeakeCapitalCorporationMember		  
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | JWH [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths)                             0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_JohnWHenryAndCompanyIncMember		  
Management fee, annual basis (in hundredths)                             2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_JohnWHenryAndCompanyIncMember		  
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths)                             20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_JohnWHenryAndCompanyIncMember		  
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Rotella [Member]                                
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.0833%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_RotellaCapitalManagementIncMember		                              
Management fee, annual basis (in hundredths) 1.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_RotellaCapitalManagementIncMember		                              
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_RotellaCapitalManagementIncMember		                              
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Winton [Member]                                
Trading Advisors for Partnership [Line Items]                                
Trading advisor name Winton Capital Management Limited                              
Management Fee [Abstract]                                
Management fee, monthly basis (in hundredths) 0.125%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_WintonCapitalManagementLimitedMember		                             0.1667%dwsf_ManagementFeePercentageMonthly
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_WintonCapitalManagementLimitedMember
Management fee, annual basis (in hundredths) 1.50%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_WintonCapitalManagementLimitedMember		                             2.00%dwsf_ManagementFeePercentageAnnualized
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_WintonCapitalManagementLimitedMember
Incentive Fee [Abstract]                                
Incentive fee, monthly trading profits basis (in hundredths) 20.00%dwsf_IncentiveFeeRateTradingAdvisor
/ dei_LegalEntityAxis
= dwsf_MorganStanleySmithBarneySpectrumTechnicalLPMember
/ dwsf_TradingAdvisorAxis
= dwsf_WintonCapitalManagementLimitedMember