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STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Investments in Affiliated Trading Companies:    
Total Investments in Affiliated Trading Companies, cost 69,876,038us-gaap_CostMethodInvestments 120,346,382us-gaap_CostMethodInvestments
Class A [Member]    
PARTNERS' CAPITAL    
PARTNERS' CAPITAL (in units) 41,087.076us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember		 64,765.171us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
Class B [Member]    
PARTNERS' CAPITAL    
PARTNERS' CAPITAL (in units) 7,618.551us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember		 12,653.002us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
Class C [Member]    
PARTNERS' CAPITAL    
PARTNERS' CAPITAL (in units) 7,627.333us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_ClassCMember		 11,494.307us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_ClassCMember
Class D [Member]    
PARTNERS' CAPITAL    
PARTNERS' CAPITAL (in units) 3,072.942us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_CapitalUnitClassDMember		 5,095.602us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_CapitalUnitClassDMember
Class Z [Member]    
PARTNERS' CAPITAL    
PARTNERS' CAPITAL (in units) 1,372.607us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_ClassZMember		 2,813.623us-gaap_PartnersCapitalAccountUnits
/ us-gaap_CapitalUnitsByClassAxis
= mfhv_ClassZMember