Intangible Assets - Amortization Expense (Table) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTANGIBLE ASSETS [Abstract]
Favorable lease terms	$ (291)	$ (1,016)	$ (583)	$ (2,032)
Total	$ (291)	$ (1,016)	$ (583)	$ (2,032)

The aggregate amortization of the asset/liability arising from the market value of the time charter chartered-out assumed from a vessel acquisition net of any acceleration of intangibles.

No definition available.

Name:	NMM_AmortizationOfFairValueOfIntangibleAssets
Namespace Prefix:	NMM_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration