Fair Value of Financial Instruments (Table) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
FAIR VALUE OF FINANCIAL INSTRUMENTS [ABSTRACT]
Cash and cash equivalents - Book Value	$ 99,495	$ 35,346	$ 32,132	$ 48,078
Cash and cash equivalents - Fair Value	99,495	35,346
Restricted cash - Book Value	954	34,606
Restricted cash - Fair Value	954	34,606
Accounts receivable, net - Book Value	13,278us-gaap_AccountsReceivableNetCurrent	16,298us-gaap_AccountsReceivableNetCurrent
Accounts receivable, net - Fair Value	13,278	16,298
Loans receivable from affiliates - Book Value	750	280
Loans receivable from affiliates - Fair Value	750	280
Accounts payable - Book Value	(3,824)us-gaap_AccountsPayableCurrent	(3,171)us-gaap_AccountsPayableCurrent
Accounts payable - Fair Value	(3,824)	(3,171)
Amounts due to related parties - Book Value	(1,880)us-gaap_DueToRelatedPartiesCurrent	(204)us-gaap_DueToRelatedPartiesCurrent
Amounts due to related parties - Fair Value	(1,880)	(204)
Term Loan B facility, net of unamortized discount - Book Value	(429,930)NMM_TermLoanBFacilityAmountOutstanding	(433,304)NMM_TermLoanBFacilityAmountOutstanding
Term Loan B facility, net of unamortized discount - Fair Value	(431,764)	(440,514)
Other long-term debt - Book Value	(153,349)us-gaap_LineOfCredit	(100,020)us-gaap_LineOfCredit
Other long-term debt - Fair Value	$ (153,349)	$ (100,020)

Fair value as of the balance sheet date of obligations due to all related parties.

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Fair value of portion of loans receivable from related parties.

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The fair value of cash and cash equivalent items which are restricted as to withdrawal or usage.

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Carrying amount as of the balance sheet date of term loan B facility.

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Fair value of term loan B facility at balance sheet date.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Fair value portion of liabilities incurred for goods and services received that are used in an entity's business and related party payables.

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Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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-Glossary Cash

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Fair value of the amount outstanding under the credit facility.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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