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Acquisitions - Talen's Marine & Fuel, LLC (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Business Acquisition [Line Items]                        
Revenues $ 376,983us-gaap_SalesRevenueNet $ 377,088us-gaap_SalesRevenueNet $ 403,261us-gaap_SalesRevenueNet $ 484,809us-gaap_SalesRevenueNet $ 467,132us-gaap_SalesRevenueNet $ 355,578us-gaap_SalesRevenueNet $ 356,673us-gaap_SalesRevenueNet $ 433,356us-gaap_SalesRevenueNet $ 1,642,141us-gaap_SalesRevenueNet $ 1,612,739us-gaap_SalesRevenueNet $ 1,490,361us-gaap_SalesRevenueNet  
Net income (loss) 4,374us-gaap_IncomeLossAttributableToParent (26,906)us-gaap_IncomeLossAttributableToParent (968)us-gaap_IncomeLossAttributableToParent 11,795us-gaap_IncomeLossAttributableToParent (39,259)us-gaap_IncomeLossAttributableToParent 191us-gaap_IncomeLossAttributableToParent 9,078us-gaap_IncomeLossAttributableToParent 16,636us-gaap_IncomeLossAttributableToParent (11,705)us-gaap_IncomeLossAttributableToParent (13,354)us-gaap_IncomeLossAttributableToParent 101,987us-gaap_IncomeLossAttributableToParent  
Talen's Marine and Fuel, LLC [Member]                        
Business Acquisition [Line Items]                        
Purchase price of acquisition                       103,368us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
Liabilities assumed                       2,971us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
Proceeds from assets sold         56,000mmlp_BusinessAcquisitionCostOfAcquiredEntityProceedsReceivedForAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
        56,000mmlp_BusinessAcquisitionCostOfAcquiredEntityProceedsReceivedForAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
56,000mmlp_BusinessAcquisitionCostOfAcquiredEntityProceedsReceivedForAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
56,000mmlp_BusinessAcquisitionCostOfAcquiredEntityProceedsReceivedForAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
Excess of carrying value of assets sold         4,268mmlp_BusinessAcquisitionCostOfAcquiredEntityExcessOfCarryingValueOfAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
        4,268mmlp_BusinessAcquisitionCostOfAcquiredEntityExcessOfCarryingValueOfAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
4,268mmlp_BusinessAcquisitionCostOfAcquiredEntityExcessOfCarryingValueOfAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
4,268mmlp_BusinessAcquisitionCostOfAcquiredEntityExcessOfCarryingValueOfAssetsSold
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
Excess carrying value of assets over the purchase price         43,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
        43,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
43,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
43,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
Revenues                 5,227us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
5,226us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
   
Net income (loss)                 2,452us-gaap_IncomeLossAttributableToParent
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
2,432us-gaap_IncomeLossAttributableToParent
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
   
Selling, General and Administrative Expenses [Member] | Talen's Marine and Fuel, LLC [Member]                        
Business Acquisition [Line Items]                        
Acquisition related costs                   $ 58us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= mmlp_TalensMarineAndFuelLlcMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember