Transactions with Related Parties - Vessels Charter Hire and Management Fees (Details) - USD ($)
1 Months Ended 4 Months Ended 5 Months Ended 8 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Apr. 30, 2018
Apr. 30, 2016
Jun. 07, 2017
Jun. 05, 2015
Aug. 30, 2019
Dec. 31, 2017
Oct. 31, 2017
Nov. 30, 2018
Nov. 30, 2016
Nov. 18, 2014
Dec. 13, 2013
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Voyage expenses                           $ 0 $ 0 $ 651,000
Other income                           44,750,000 14,500,000 6,140,000
Proceeds from sale of business             $ 20,000,000             3,000,000 0 0
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 | Management agreement                                
Management fees             44,264,000               68,871,000 62,157,000
Other income             7,560,000               0 0
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 | Management agreement                                
Termination date of the administrative services agreement                           May 2020    
Management fees             72,624,000               92,993,000 94,973,000
Other income                           $ 8,190,000 0 0
Navios Acquisition | MR2 product tanker and chemical tanker vessel                                
Daily management fee     $ 6,350 $ 6,000                   6,500    
Navios Acquisition | LR1 product tanker vessel                                
Daily management fee     7,150 7,000                   7,150    
Navios Acquisition | VLCC vessel                                
Daily management fee     $ 9,500 $ 9,500                   $ 9,500    
Navios Europe I | Management agreement                                
Management fees             14,506,000               22,377,000 21,472,000
Duration of agreements                         6 years      
Navios Midstream | Management agreement                                
Termination date of the administrative services agreement                           Dec. 31, 2018    
Management fees                             20,739,000 20,805,000
Duration of agreements                       5 years        
Navios Midstream | VLCC vessel | Management agreement                                
Daily management fee                             9,500  
Navios Europe II | Management agreement                                
Management fees             17,790,000               $ 22,186,000 $ 22,055,000
Duration of agreements           6 years                    
Navios Containers | Management agreement                                
Management fees             43,239,000 $ 16,702,000   $ 48,490,000            
Duration of agreements         5 years                      
Other income             6,090,000                  
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    
NSM                                
Administrative services agreement term in years                           5 years    
NSM | Management agreement                                
Termination date of the administrative services agreement                           Aug. 29, 2024    
Management fees   $ 14,372,000                            
NSM | Management agreement | Chartered-in vessels                                
Daily management fee             30                  
NSM | Owned Vessels | Management agreement                                
Daily management fee             $ 3,700                  
NSM | Owned Vessels | Management agreement | After two years                                
Rate of annual increase in management fees             3.00%                  
Navios Containers                                
Management fees $ 5,281,000