Summary of Significant Accounting Policies - Change in Accounting Principle (Details) - New Accounting Pronouncemen, Early Adoption, Effect $ in Thousands	12 Months Ended
Dec. 31, 2014 USD ($)
New Accounting Pronouncement Early Adoption [Line Items]
Reduction of total assets, due to change in accounting principle	$ 7,305
Reduction of long term debt, due to change in accounting principle	5,102
Reduction of current portion of long term debt, due to change in accounting principle	$ 2,203

Amount of the cumulative effect of the change in accounting principle or new accounting pronouncement on current portion of long term debt in the statement of financial position as of the beginning of the earliest period presented.

No definition available.

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