Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 10, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Letters of guarantee and letters of credit     $ 600     $ 590
Cash consideration for purchase of vessel     10,255 $ 0    
Other long term assets     44,356     37,801
Restricted cash     2,978 $ 4,462   6,558
Navios Logistics            
Collateralized cash amount released   $ 2,900     $ 2,900  
Vitol S.A. | Navios Logistics            
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, 2019.      
Vale | Navios Logistics            
Litigation Settlement, Amount Awarded from Other Party $ 21,500          
Other income     $ 1,157      
Bulk carrier vessel            
Vessel capacity in DWT     82,000 dwt      
Date of expected delivery     Q4 2019      
Cash consideration for purchase of vessel     $ 2,705      
Other long term assets     2,786      
Contractual Obligation     5,410      
Construction of river and estuary tanker | Navios Logistics            
Contractual obligation next twelve months     $ 7,222      
Covers for Dry Barges | Navios Logistics            
Contractual Obligation           $ 1,115
Newbuilding bulk carriers            
Lease Term     10 years      
Number of vessels     2      
Cash consideration for purchase of vessel     $ 5,570      
Other long term assets     5,765      
Contractual obligation next twelve months     $ 11,140      
First newbuilding bulk carrier            
Vessel capacity in DWT     82,000 dwt      
Date of expected delivery     Q3 2019      
Second newbuilding bulk carrier            
Vessel capacity in DWT     82,000 dwt      
Date of expected delivery     Q1 2020      
Bulk carrier vessel            
Lease Term     10 years      
Number of vessels     1      
Vessel capacity in DWT     81,000 dwt      
Date of expected delivery     Q4 2019      
Cash consideration for purchase of vessel     $ 2,795      
Other long term assets     2,872      
Contractual obligation next twelve months     $ 5,590