Intangible Assets (Table) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTANGIBLE ASSETS [Abstract]
Favourable lease terms, Cost	$ 158,987	$ 248,528	$ 248,528
Favourable lease terms, Accumulated amortization	(84,932)	(129,123)	(88,049)
Favourable lease terms, Net book value	74,055us-gaap_FiniteLivedIntangibleAssetsNet	119,405us-gaap_FiniteLivedIntangibleAssetsNet	160,479us-gaap_FiniteLivedIntangibleAssetsNet
Additions - Cost	0	0
Additions - Accumulated amortization	(23,287)us-gaap_AmortizationOfIntangibleAssets	(37,869)us-gaap_AmortizationOfIntangibleAssets
Additions - Net Book Value	(23,287)	(37,869)
Accelerated amortization - Cost	(89,541)NMM_AcceleratedAmortizationCost	0NMM_AcceleratedAmortizationCost
Accelerated amortization - Accumulated Amortization	67,478	(3,205)
Accelerated amortization - Net Book Value	$ (22,063)NMM_AcceleratedAmortizationNetBookValue	$ (3,205)NMM_AcceleratedAmortizationNetBookValue

The amount of accelerated amortization as far as accumulated amortization is concerned.

No definition available.

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- Definition

The amount of accelerated amortization as far as cost is concerned.

+ References

No definition available.

+ Details

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- Definition

The amount of accelerated amortization as far as Net Book Value is concerned.

+ References

No definition available.

+ Details

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

+ Details

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

+ Details

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