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Fair Value of Financial Instruments - Fair Value Measurements (Table) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Non-recurring Basis [Line Items]    
Cash and cash equivalents $ 99,495us-gaap_CashAndCashEquivalentsFairValueDisclosure $ 35,346us-gaap_CashAndCashEquivalentsFairValueDisclosure
Restricted cash 954NMM_RestrictedCashCashEquivalentsFairValueDisclosure 34,606NMM_RestrictedCashCashEquivalentsFairValueDisclosure
Loans receivable from affiliates 750NMM_LoansFromRelatedPartiesFairValueDisclosure 280NMM_LoansFromRelatedPartiesFairValueDisclosure
Term Loan B facility, net of unamortized discount (431,764)NMM_TermLoanBFacilityFairValueAmountOutstanding (440,514)NMM_TermLoanBFacilityFairValueAmountOutstanding
Other long-term debt (153,349)us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding (100,020)us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Level I    
Fair Value Assets And Liabilities Measured On Recurring And Non-recurring Basis [Line Items]    
Cash and cash equivalents 99,495us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 35,346us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member
Restricted cash 954NMM_RestrictedCashCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 34,606NMM_RestrictedCashCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member
Level II    
Fair Value Assets And Liabilities Measured On Recurring And Non-recurring Basis [Line Items]    
Loans receivable from affiliates 750NMM_LoansFromRelatedPartiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 280NMM_LoansFromRelatedPartiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member
Term Loan B facility, net of unamortized discount (431,764)NMM_TermLoanBFacilityFairValueAmountOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1] (440,514)NMM_TermLoanBFacilityFairValueAmountOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
Other long-term debt $ (153,349)us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1] $ (100,020)us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
[1] The fair value of the Company's debt is estimated based on currently available debt with similar contract terms, interest rate and remaining maturities as well as taking into account our creditworthiness.