Intangible Assets - Amortization Expense (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTANGIBLE ASSETS [Abstract]
Favorable lease terms	$ (3,748)	$ (10,872)	$ (15,861)
Acceleration of favorable lease terms	0	0	(20,526)
Total	$ (3,748)	$ (10,872)	$ (36,387)

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