Summary of Significant Accounting Policies - Basis Of Presentation, Subsidiaries, Affiliates and Restricted Cash (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash $ 2,978 $ 4,462 $ 6,558
Effect of retrospective application      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase/ (decrease) in net cash provided by operating activities   (2,899)  
Increase/ (decrease) in net cash provided financing activities   1,976  
Increase/(decrease) in cash and cash equivalents   $ (923)  
Navios Logistics      
Percentage of Navios Holdings ownership      
Ownership percentage of Navios Holdings 63.80%    
Navios Partners and its subsidiaries      
Percentage of Navios Holdings ownership      
Economic interest 20.20%    
General partner interest of Navios Holdings 2.00%    
Navios Acquisition and its subsidiaries      
Percentage of Navios Holdings ownership      
Economic interest 48.30%    
Acropolis Chartering and Shipping Inc. ("Acropolis")      
Percentage of Navios Holdings ownership      
Ownership percentage of Navios Holdings 50.00%    
Economic interest 35.00%    
Navios Europe I and its subsidiaries      
Percentage of Navios Holdings ownership      
Economic interest 47.50%    
Navios Europe II and its subsidiaries      
Percentage of Navios Holdings ownership      
Economic interest 47.50%    
Navios Containers and its subsidiaries      
Percentage of Navios Holdings ownership      
Economic interest 3.10%