Transactions with Related Parties - Vessels Charter Hire and Management Fees (Details) - USD ($)
 1 Months Ended 4 Months Ended 5 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2018
Apr. 30, 2018
Apr. 30, 2016
Jun. 07, 2017
Jun. 05, 2015
Oct. 31, 2017
Nov. 30, 2018
Nov. 30, 2016
Nov. 18, 2014
Dec. 13, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Voyage expenses                     $ 0 $ 651,000 $ 1,711,000
Navios Fantastiks | Charter hire agreement                          
Charter hire daily rate                     12,500    
Navios Gemini | Charter hire agreement                          
Charter hire daily rate                     7,600    
Navios Pollux | Charter hire agreement                          
Charter hire daily rate                     11,400    
Navios Sun, Navios Orbiter, Navios Soleil, Navios Alegria, Navios Harmony and Navios Hyperion | Charter hire agreement                          
Charter hire daily rate                     $ 12,000    
Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun | Minimum                          
Lease term                     9 months    
Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun | Maximum                          
Lease term                     12 months    
Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun | Charter hire agreement                          
Profit sharing, Percentage allocation based on earnings                     50.00%    
Navios Fulvia | Charter hire agreement                          
Date of agreement                     Nov. 30, 2016    
Charter hire daily rate                     $ 11,500    
Duration of agreements               3 months          
Navios Partners                          
Termination date of the administrative services agreement                     December 31, 2022    
Management fees                     $ 68,871,000 62,157,000 59,209,000
Navios Partners | Ultra-Handymax vessel                          
Daily management fee           $ 4,100         4,200    
Navios Partners | Panamax vessel                          
Daily management fee           4,200         4,300    
Navios Partners | Capesize vessel                          
Daily management fee           5,250         5,250    
Navios Partners | Container vessel of 6,800 TEU                          
Daily management fee           6,700         6,700    
Navios Partners | Container vessel more than 8,000 TEU                          
Daily management fee           7,400         7,400    
Navios Partners | Container vessel more than 13,000 TEU                          
Daily management fee           $ 8,750         $ 8,750    
Navios Acquisition                          
Termination date of the administrative services agreement                     May 2020    
Management fees                     $ 92,993,000 94,973,000 97,866,000
Navios Acquisition | MR2 product tanker and chemical tanker vessel                          
Daily management fee   $ 6,350 $ 6,000               $ 6,500    
Navios Acquisition | MR2 product tanker and chemical tanker vessel | Extended management agreement                          
Duration of agreements                     2 years    
Navios Acquisition | LR1 product tanker vessel                          
Daily management fee   7,150 7,000               $ 7,150    
Navios Acquisition | LR1 product tanker vessel | Extended management agreement                          
Duration of agreements                     2 years    
Navios Acquisition | VLCC vessel                          
Daily management fee   $ 9,500 $ 9,500               $ 9,500    
Navios Acquisition | VLCC vessel | Extended charter hire agreement                          
Duration of agreements                     2 years    
Navios Europe I                          
Management fees                     $ 22,377,000 21,472,000 20,855,000
Navios Europe I | Management agreement                          
Duration of agreements                   6 years      
Navios Midstream                          
Management fees                     $ 20,739,000 20,805,000 20,862,000
Navios Midstream | Management agreement                          
Duration of agreements                 5 years        
Navios Midstream | VLCC vessel | Management agreement                          
Termination date of the administrative services agreement                     Dec. 31, 2018    
Daily management fee                     $ 9,500    
Navios Europe II                          
Management fees                     $ 22,186,000 22,055,000 $ 23,527,000
Navios Europe II | Management agreement                          
Duration of agreements         6 years                
Navios Containers | Management agreement                          
Management fees             $ 48,490,000         $ 16,702,000  
Duration of agreements       5 years                  
Navios Containers | Automatic extension of management agreement                          
Duration of agreements                     5 years    
Navios Containers | Container vessel up to 5,500 TEU | Management agreement                          
Daily management fee                     $ 6,100    
Navios Containers | Container vessel above 5,500 TEU and up to 8,000 TEU | Management agreement                          
Daily management fee                     6,700    
Navios Containers | Container vessel above 8,000 TEU and up to 10,000 TEU | Management agreement                          
Daily management fee                     $ 7,400    
Navios Containers | Navios Midstream                          
Management fees $ 5,281,000