General partner units issued during the year due to the sale of units.

No definition available.

Name:	NMM_GeneralPartnersCapitalAccountUnitsSaleOfUnits
Namespace Prefix:	NMM_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Monetary value of the issuance of new general partner units during the period, net of the issuance cost.

+ References

No definition available.

+ Details

Name:	NMM_GeneralPartnersCapitalAccountValueSaleOfUnits
Namespace Prefix:	NMM_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 16

-Subparagraph a, b

-Article 6

+ Details

Name:	us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the issuance of common limited partners units during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount per share or per unit of equity securities issued by non-development stage entity.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_GeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_LimitedPartnerMember
Namespace Prefix:
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Period Type:

Issuance of Units (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended				12 Months Ended			0 Months Ended
	Feb. 11, 2015	Feb. 14, 2014	Sep. 25, 2013	Feb. 06, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 18, 2014
Class Of Stock [Line Items]
Common Limited Partner's capital account units sold in public offering	4,000,000	5,500,000	5,000,000	4,500,000
Unit price	$ 13.09us-gaap_SharesIssuedPricePerShare	$ 17.3us-gaap_SharesIssuedPricePerShare	$ 14.26us-gaap_SharesIssuedPricePerShare	$ 14.15us-gaap_SharesIssuedPricePerShare
Proceeds from issuance of Common Limited partners units					$ 104,499	$ 148,022	$ 68,563
Offering costs	320us-gaap_PaymentsOfStockIssuanceCosts	306us-gaap_PaymentsOfStockIssuanceCosts	179us-gaap_PaymentsOfStockIssuanceCosts	195us-gaap_PaymentsOfStockIssuanceCosts
Proceeds from issuance of General partners units					2,233	3,167	1,472
Limited Common Unitholders
Class Of Stock [Line Items]
Common Limited Partner's capital account units sold in public offering					6,325,000	10,925,000	4,600,000
Limited Common Unitholders \| Overallotment Option
Class Of Stock [Line Items]
Common Limited Partner's capital account units sold in public offering	600,000		750,000	675,000				825,000
Limited Common Unitholders \| Gross Proceeds
Class Of Stock [Line Items]
Proceeds from issuance of Common Limited partners units	52,360	95,150	71,300	63,675
Limited Common Unitholders \| Gross Proceeds \| Overallotment Option
Class Of Stock [Line Items]
Proceeds from issuance of Common Limited partners units	7,854		10,695	9,551				14,273
Limited Common Unitholders \| Net Proceeds
Class Of Stock [Line Items]
Proceeds from issuance of Common Limited partners units	50,120	91,135	68,200	60,840
Limited Common Unitholders \| Net Proceeds \| Overallotment Option
Class Of Stock [Line Items]
Proceeds from issuance of Common Limited partners units	7,518		10,230	9,126				13,670
General Partner
Class Of Stock [Line Items]
General Partner's capital account units sold in public offering	81,633	112,245	102,041	91,837	129,082	222,960	93,878
Proceeds from issuance of General partners units					2,233	3,167	1,472
General Partner \| Overallotment Option
Class Of Stock [Line Items]
General Partner's capital account units sold in public offering	12,245		15,306	13,776				16,837
General Partner \| Net Proceeds
Class Of Stock [Line Items]
Proceeds from issuance of General partners units	1,069	1,942	1,455	1,299
General Partner \| Net Proceeds \| Overallotment Option
Class Of Stock [Line Items]
Proceeds from issuance of General partners units	$ 160		$ 218	$ 195				291