2.4.0.841120 - Disclosure - BORROWINGS - Schedule of long-term debt (Table) (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$FYp0Qp0ehttp://www.sec.gov/CIK0001415921instant2013-06-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$FYm1Q4ehttp://www.sec.gov/CIK0001415921instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 1us-gaap_DebtDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0BORROWINGS [Abstract]2false 2NMM_TermLoanBFacilityFaceAmountNMM_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse250000000250000USD$falsetruefalse2truefalsefalse00USD$falsetruefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Term Loan B facility3false 2NMM_CreditFacilityNMM_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1truefalsefalse100020000100020falsefalsefalse2truefalsefalse299709000299709falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Credit facilities4false 2us-gaap_DebtInstrumentCarryingAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse350020000350020falsefalsefalse2truefalsefalse299709000299709falsefalsefalsexbrli:monetaryItemTypemonetaryIncluding current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Total borrowings5false 2us-gaap_DebtInstrumentUnamortizedDiscountus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-4989000-4989falsefalsefalse2truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Less: Unamortized discount6false 2us-gaap_LongTermDebtCurrentus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-2472000-2472falsefalsefalse2truefalsefalse-23727000-23727falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. 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