Annual rate of increase of management fees.

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- Definition

The interval time between vessel drydocking and special surveys.

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No definition available.

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The amount charged as daily management fee.

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No definition available.

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The scrap value of vessels per light weight ton (LWT).

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No definition available.

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- Definition

Utilization rate of fleet based on the fleet's historical performance.

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No definition available.

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- Definition

Amount of significant additions in the period in other assets (current, noncurrent, or unclassified).

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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The amount of amortization of deferred charges applied against earnings during the period.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Amount of cash inflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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No definition available.

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Distribution/dividend policy defined in the operating or partnership agreement of the LLC or LP, which governs the distributions of cash or stock or units to members or limited partners. Policy may include minimum amount of cash or stock or units, allocation method among unit holders, timing of payment, and reinvestment procedures.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Description of the methodology for computing depreciation for classes of depreciable assets.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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No definition available.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended			24 Months Ended	11 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2011
Property Plant And Equipment [Line Items]
Restricted cash	$ 954,000	$ 1,177,000		$ 954,000
Long term restricted cash	0	33,429,000		0
Decrease in restricted cash	33,429,000us-gaap_DecreaseInRestrictedCash	64,750,000us-gaap_DecreaseInRestrictedCash	0us-gaap_DecreaseInRestrictedCash
Allowance for doubtful accounts	49,000	613,000	458,000	49,000		49,000
Depreciation method	straight line
Scrap value per light weight ton			285NMM_ScrapValuePerLightWeightTon	340NMM_ScrapValuePerLightWeightTon
Interval between vessel drydockings / special surveys	Every 30 or 60 months
Amortization of deferred drydock and special survey costs	761,000us-gaap_AmortizationOfDeferredCharges	0us-gaap_AmortizationOfDeferredCharges	25,000us-gaap_AmortizationOfDeferredCharges
Annual growth factor of management fees	3.00%NMM_AnnualGrowthFactorManagementFees
Utilization rate of fleet	98.60%NMM_UtilizationRateOfFleet
Amortization and write-off of deferred financing cost and discount	3,091,000	4,035,000	787,000
Foreign currency exchange losses	13,000	13,000	1,000
Distribution policy members or limited partners description	As per the Partnership Agreement, within 45 days following the end of each quarter, an amount equal to 100% of Available Cash with respect to such quarter shall be distributed to the partners as of the record date selected by the Board of Directors.
Retention and pledged accounts
Property Plant And Equipment [Line Items]
Restricted cash	954,000			954,000
Guarantee claim
Property Plant And Equipment [Line Items]
Decrease in restricted cash	831,000
Drybulk vessels
Property Plant And Equipment [Line Items]
Vessel useful life	25 years
Container vessels
Property Plant And Equipment [Line Items]
Vessel useful life	30 years
Ultra-Handymax Vessels
Property Plant And Equipment [Line Items]
Daily management fee	4,000	4,650
Panamax Vessels
Property Plant And Equipment [Line Items]
Daily management fee	4,100	4,550
Capesize Vessels
Property Plant And Equipment [Line Items]
Daily management fee	5,100	5,650
Container vessel of TEU 6,800
Property Plant And Equipment [Line Items]
Daily management fee	6,500
Container of more than TEU 8,000
Property Plant And Equipment [Line Items]
Daily management fee	7,200
Container of more than TEU 13,000
Property Plant And Equipment [Line Items]
Daily management fee					8,500
Maintenance and Replacement
Property Plant And Equipment [Line Items]
Capital expenditures	$ 24,047,000	$ 14,593,000	$ 18,869,000