Transactions with Related Parties - Management and Administrative Agreements (Details) - USD ($)
3 Months Ended 6 Months Ended 8 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Aug. 30, 2019
Dec. 31, 2019
Proceeds from sale of business         $ 20,000,000  
Other (expense)/income, net $ (1,593,000) $ 11,449,000 $ (3,154,000) $ 16,758,000    
General and administrative expenses 8,836,000 7,874,000 15,798,000 15,406,000    
Accrued expenses and other liabilities 57,350,000   57,350,000     $ 51,180,000
Management agreement            
Accrued expenses and other liabilities 8,924,000   8,924,000      
NSM            
General and administrative expenses 2,377,000 0 $ 4,639,000 0    
Administrative services agreement term in years     5 years      
NSM | Management agreement            
Management fees $ 11,537,000 0 $ 22,525,000 0    
Duration of agreements     5 years      
Termination date of agreement     Aug. 29, 2024      
NSM | Management agreement | Owned Vessels            
Daily management fee     $ 3,700      
NSM | Management agreement | After two years | Owned Vessels            
Rate of annual increase in management fees 3.00%   3.00%      
NSM | Management agreement | Chartered-in vessels            
Daily management fee     $ 30      
NSM | Automatic extension of management agreement            
Duration of agreements     5 years      
Navios Partners | Management agreement            
Management fees   54,080,000   109,805,000    
Other (expense)/income, net   3,780,000   7,770,000    
Navios Partners | Administrative agreement            
General and administrative expenses   6,318,000   12,782,000    
Termination date of agreement     Dec. 31, 2022      
Navios Acquisition | Management agreement            
Termination date of agreement     May 31, 2020      
Navios Acquisition | Administrative agreement            
Termination date of agreement     May 31, 2020      
Navios Logistics | Administrative agreement            
General and administrative expenses $ 286,000 $ 286,000 $ 572,000 $ 572,000    
Termination date of agreement     Dec. 31, 2021      
Navios Midstream | Management agreement            
Termination date of agreement     Dec. 31, 2018