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Investment Risks (Details)
Dec. 31, 2014
Future [Member] | Exchange Traded [Member]  
Derivative [Line Items]  
Percentage of total investments (in hundredths) 64.48%mflv_PercentageOfTotalInvestments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Forward Contracts [Member] | Off-Exchange-Traded [Member]  
Derivative [Line Items]  
Percentage of total investments (in hundredths) 35.52%mflv_PercentageOfTotalInvestments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_TransactionTypeAxis
= us-gaap_OverTheCounterMember