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STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)
Class A [Member]
Class B [Member]
Class C [Member]
Class D [Member]
Class Z [Member]
Total
Balance at Dec. 31, 2011 $ 32,837,331us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
$ 5,961,752us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
$ 9,577,626us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
$ 60,698us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
$ 1,003,817us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
$ 49,441,224us-gaap_PartnersCapital
Increase (Decrease) in Partners' Capital [Roll Forward]            
Subscriptions 496,500us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
125,000us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
621,500us-gaap_PartnersCapitalAccountSaleOfUnits
Net Income (Loss) (1,873,111)us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
(306,932)us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
(551,918)us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
(1,173)us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
(37,035)us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
(2,770,169)us-gaap_NetIncomeLossAllocatedToLimitedPartners
Redemptions (10,088,534)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
(1,979,638)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
(1,614,769)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
(37,519)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
(485,651)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
(14,206,111)us-gaap_PartnersCapitalAccountRedemptions
Balance at Dec. 31, 2012 21,372,186us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
3,800,182us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
7,410,939us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
22,006us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
481,131us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
33,086,444us-gaap_PartnersCapital
Increase (Decrease) in Partners' Capital [Roll Forward]            
Subscriptions 35,000us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
22,122us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
57,122us-gaap_PartnersCapitalAccountSaleOfUnits
Net Income (Loss) 132,078us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
48,858us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
70,919us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
116us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
12,063us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
264,034us-gaap_NetIncomeLossAllocatedToLimitedPartners
Redemptions (6,898,651)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
(874,689)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
(3,481,356)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
(22,122)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
(100,203)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
(11,377,021)us-gaap_PartnersCapitalAccountRedemptions
Balance at Dec. 31, 2013 14,640,613us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
2,974,351us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
4,000,502us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
415,113us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
22,030,579us-gaap_PartnersCapital
Increase (Decrease) in Partners' Capital [Roll Forward]            
Subscriptions 25,000us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
0us-gaap_PartnersCapitalAccountSaleOfUnits
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
25,000us-gaap_PartnersCapitalAccountSaleOfUnits
Net Income (Loss) 539,868us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
80,494us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
99,734us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
20,284us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
740,380us-gaap_NetIncomeLossAllocatedToLimitedPartners
Redemptions (5,850,567)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
(1,410,486)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
(1,984,218)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
0us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
(272,338)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
(9,517,609)us-gaap_PartnersCapitalAccountRedemptions
Balance at Dec. 31, 2014 $ 9,354,914us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember
$ 1,644,359us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
$ 2,116,018us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassCMember
$ 0us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassDMember
$ 163,059us-gaap_PartnersCapital
/ us-gaap_CapitalUnitsByClassAxis
= mflv_CapitalUnitClassZMember
$ 13,278,350us-gaap_PartnersCapital