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Employee Benefit Plan | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Employee Benefit Plan |
| 16. | Employee Benefit Plan
NMM has a qualified 401(k) plan that covers substantially all employees who have completed at least six months of service and meet minimum age requirements. Participants may contribute a portion of their compensation to the plan, up to the maximum amount permitted under Section 401(k) of the Internal Revenue Code. Participants become fully vested after six years of service. NMM matches a portion of the participants’ contributions. NMM’s matching contributions for the years ended December 31, 2018 and 2017 were approximately $0.2 million.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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