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Segment Information (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue $ 227,356us-gaap_Revenues $ 198,159us-gaap_Revenues $ 205,435us-gaap_Revenues
Asia      
Revenue 125,572us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 119,776us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 151,608us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Europe      
Revenue 64,858us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 48,906us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 29,658us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
North America      
Revenue 19,943us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 21,334us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 15,968us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Australia      
Revenue $ 16,983us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= NMM_AustraliaMember		 $ 8,143us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= NMM_AustraliaMember		 $ 8,201us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= NMM_AustraliaMember