Transactions with Related Parties - Vessels Charter Hire and Management Fees (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2016
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 07, 2017
Jun. 05, 2015
Sep. 30, 2018
Oct. 31, 2017
Sep. 30, 2017
Nov. 30, 2016
Nov. 18, 2014
Dec. 13, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Voyage expenses     $ 0 $ 0     $ 0   $ 651,000       $ 651,000 $ 1,711,000 $ 39,727,000
Minimum | Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun                              
Lease term             9 months           9 months    
Maximum | Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun                              
Lease term             12 months           12 months    
Charter hire agreement | Navios Fantastiks                              
Charter hire daily rate             $ 12,500           $ 12,500    
Charter hire agreement | Navios Gemini                              
Charter hire daily rate             7,600           7,600    
Charter hire agreement | Navios Pollux                              
Charter hire daily rate             11,400           11,400    
Charter hire agreement | Navios Sun, Navios Orbiter, Navios Soleil, Navios Alegria, Navios Harmony and Navios Hyperion                              
Charter hire daily rate             $ 12,000           $ 12,000    
Charter hire agreement | Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun                              
Profit sharing, Percentage allocation based on earnings             50.00%           50.00%    
Charter hire agreement | Navios Fulvia                              
Date of agreement             Nov. 30, 2016           Nov. 30, 2016    
Charter hire daily rate             $ 11,500           $ 11,500    
Duration of agreements                   3 months          
Extended charter hire agreement | Navios Apollon                              
Date of agreement                         Apr. 30, 2015    
Lease term                         one year    
Charter hire daily rate                         $ 12,500    
Profit sharing, Percentage allocation based on earnings                         50.00%    
Extended charter hire agreement | Navios Libra                              
Date of agreement                         Apr. 30, 2015    
Lease term                         one year    
Charter hire daily rate                         $ 12,000    
Profit sharing, Percentage allocation based on earnings                         50.00%    
Extended charter hire agreement | Navios Felicity                              
Date of agreement                         Apr. 30, 2015    
Lease term                         one year    
Charter hire daily rate                         $ 12,000    
Profit sharing, Percentage allocation based on earnings                         50.00%    
Extended charter hire agreement | Navios Hope                              
Date of agreement                         Apr. 30, 2015    
Lease term                         one year    
Charter hire daily rate                         $ 10,000    
Profit sharing, Percentage allocation based on earnings                         50.00%    
Navios Partners                              
Termination date of the administrative services agreement             December 31, 2022           December 31, 2022    
Management fees     17,220 16,270     $ 51,292   44,936       $ 62,157 59,209 56,504
Terms of reimbursement of fees and expenses under the management agreement                         Effective August 31, 2016, Navios Partners could, upon request to Navios Holdings, partially or fully defer the reimbursement of dry docking and other extraordinary fees and expenses under the management agreement to a later date, but not later than January 5, 2018, and if reimbursed on a later date, such amounts would bear interest at a rate of 1% per annum over LIBOR.    
Navios Partners | Ultra-Handymax vessel                              
Daily management fee $ 4,000 $ 4,200         4,200 $ 4,100              
Navios Partners | Panamax vessel                              
Daily management fee 4,100 4,300         4,300 4,200              
Navios Partners | Capesize vessel                              
Daily management fee 5,100 5,250         5,250 5,250              
Navios Partners | Container vessel of 6,800 TEU                              
Daily management fee 6,500 6,700         6,700 6,700              
Navios Partners | Container vessel more than 8,000 TEU                              
Daily management fee 7,200 7,400         7,400 7,400              
Navios Partners | Container vessel more than 13,000 TEU                              
Daily management fee $ 8,500 $ 8,750         $ 8,750 $ 8,750              
Navios Acquisition                              
Termination date of the administrative services agreement             May 2020           May 2020    
Management fees     23,340,000 23,938,000     $ 69,652,000   71,035,000       $ 94,973,000 97,866,000 95,336,000
Navios Acquisition | Extended charter hire agreement | LR1 product tanker vessel                              
Daily management fee             $ 7,000           $ 7,000    
Duration of agreements             2 years           2 years    
Navios Acquisition | Extended management agreement | MR2 product tanker and chemical tanker vessel                              
Daily management fee             $ 6,000           $ 6,000    
Duration of agreements             2 years           2 years    
Navios Acquisition | Extended management agreement | VLCC vessel                              
Daily management fee             $ 9,500           $ 9,500    
Duration of agreements             2 years           2 years    
Navios Acquisition | Amendement of management agreement                              
Termination date of the administrative services agreement             May 31, 2018           May 31, 2018    
Navios Acquisition | Amendement of management agreement | MR2 product tanker and chemical tanker vessel                              
Daily management fee             $ 6,350           $ 6,350    
Navios Acquisition | Amendement of management agreement | LR1 product tanker vessel                              
Daily management fee             7,150           7,150    
Navios Acquisition | Amendement of management agreement | VLCC vessel                              
Daily management fee             9,500           9,500    
Navios Acquisition | Further amendement of management agreement | MR2 product tanker and chemical tanker vessel                              
Daily management fee             6,500                
Navios Acquisition | Further amendement of management agreement | LR1 product tanker vessel                              
Daily management fee             7,150                
Navios Acquisition | Further amendement of management agreement | VLCC vessel                              
Daily management fee             9,500                
Navios Europe I                              
Management fees     5,942,000 5,227,000     16,318,000   15,820,000       21,472,000 20,855,000 20,383,000
Navios Europe I | Management agreement                              
Duration of agreements                       6 years      
Navios Midstream                              
Management fees     5,244,000 5,244,000     $ 15,495,000   15,561,000       $ 20,805,000 20,862,000 17,613,000
Navios Midstream | Management agreement                              
Duration of agreements                     5 years        
Navios Midstream | Management agreement | VLCC vessel                              
Termination date of the administrative services agreement             Dec. 31, 2018           Dec. 31, 2018    
Daily management fee             $ 9,500           $ 9,500    
Navios Europe II                              
Management fees     5,556,000 5,058,000     16,357,000   16,244,000       22,055,000 $ 23,527,000 $ 9,581,000
Navios Europe II | Management agreement                              
Duration of agreements           6 years                  
Navios Containers | Container vessel of 4,250 TEU                              
Daily management fee                         6,100    
Navios Containers | Container vessel of 3,450 TEU                              
Daily management fee                         6,100    
Navios Containers | Container vessel of 5,500 TEU                              
Daily management fee                         6,100    
Navios Containers | Container vessel more than 5,500 TEU                              
Daily management fee             6,100                
Navios Containers | Container vessel more than 5,500 TEU and up to 8,000 TEU                              
Daily management fee             6,700                
Navios Containers | Container vessel more than 8,000 TEU and up to 10,000 TEU                              
Daily management fee             7,400                
Navios Containers | Management agreement                              
Management fees     $ 14,490,000 $ 6,576,000     $ 38,578,000   $ 7,491,000       $ 16,702,000    
Duration of agreements         5 years                    
Navios Containers | Automatic extension of management agreement                              
Duration of agreements             5 years           5 years