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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plan	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, 2019 and 2018 were approximately $0.2 million.