Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 10 Months Ended 12 Months Ended
Jan. 31, 2019
Feb. 10, 2017
Feb. 28, 2019
Mar. 31, 2017
Apr. 30, 2019
Oct. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Letters of guarantee and letters of credit             $ 1,577 $ 590  
Cash consideration for purchase of vessel             46,395 0 $ 60,115
Other long term assets             23,736 4,856  
Restricted cash             12,892 6,558 5,386
Claims receivable             22,224 12,307  
Other income             $ 14,582 6,140 18,175
Navios Galaxy II                  
Date of charter-in agreement             Dec. 31, 2017    
Duration of bareboat contract             10 years    
Vessel capacity in DWT             81,600 dwt    
Date of expected delivery             Q1 2020    
Contractual Obligation             $ 5,410    
Cash consideration for purchase of vessel         $ 2,705     $ 2,705  
Other long term assets             $ 2,953    
Navios Herakles I                  
Duration of bareboat contract             10 years    
Vessel capacity in DWT             81,000 dwt    
Date of expected delivery             Q3 2019    
Navios Uranus                  
Duration of bareboat contract             10 years    
Vessel capacity in DWT             81,600 dwt    
Date of expected delivery             Q4 2019    
Navios Herakles I and Navios Uranus                  
Date of charter-in agreement             Jan. 31, 2018    
Contractual Obligation             $ 11,140    
Cash consideration for purchase of vessel $ 2,800           8,340    
Other long term assets             $ 8,969    
Navios Felicity I                  
Date of charter-in agreement             Apr. 30, 2018    
Duration of bareboat contract             10 years    
Vessel capacity in DWT             81,000 dwt    
Date of expected delivery             Q4 2019    
Contractual Obligation             $ 5,590    
Cash consideration for purchase of vessel     $ 2,795       2,795    
Other long term assets             $ 3,004    
Navios Magellan II                  
Date of charter-in agreement             Oct. 31, 2018    
Duration of bareboat contract             10 years    
Vessel capacity in DWT             81,000 dwt    
Date of expected delivery             Q2 2020    
Contractual Obligation             $ 5,820    
Cash consideration for purchase of vessel           $ 2,910      
Other long term assets             3,033    
Navios Logistics                  
Collateralized cash amount released       $ 2,900          
Navios Logistics | Letter of Credit                  
Restricted cash                 $ 2,900
Navios Logistics | Vitol S.A.                  
Guarantee and indemnity letter             $ 12,000    
Guarantees             Navios Logistics has issued a guarantee and indemnity letter that guarantees the performance by Petrolera San Antonio S.A. (a consolidated subsidiary) of all its obligations to Vitol S.A. up to $12,000. This guarantee expires on March 1, 2020.    
Navios Logistics | Vale                  
Litigation Settlement, Amount Awarded from Other Party   $ 21,500              
Other income             $ 1,157    
Fire incident at the iron ore port terminal in Nueva Palmira, Uruguay | Navios Logistics                  
Claims receivable             11,571    
Insurance claims | Navios Logistics                  
Other income             $ 9,197