Preferred and Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 6 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended
Jan. 28, 2014
Feb. 29, 2016
Jul. 08, 2014
Nov. 08, 2016
Dec. 11, 2015
Dec. 15, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Preferred stock shares outstanding             49,504 73,935          
Common stock shares outstanding             117,131,407 110,468,753          
Acquisition of treasury stock, value             $ 818 $ 252          
Value of the exchange offer             12 11          
Amount of tender offer paid in cash             (9,323)            
Repurchase of preferred stock             9,323 $ 0 $ 0        
Dividends undeclared                          
Undeclared preferred dividends             10,245            
Dividends cancelled                          
Dividends cancelled             $ 5,063            
Restricted common stock                          
Number of common stock issued to employees         2,540,000 1,151,052              
Forfeited shares of common stock             2,908 9,319          
Restricted stock units                          
Vested stock units             24,970 16,960 41,748        
Number of stock options issued to employees           24,301              
Stock options                          
Exercised number of shares             0 0 143,189 153,556 29,251 130,578 130,577
Vested restricted stock units         1,000,000 1,123,003              
Navios Holdings                          
Total amount of shares issued                 $ 643        
First stock issuance                          
Exercised number of shares                 15,000        
Exercise price                 $ 3.18        
Second stock issuance                          
Exercised number of shares                 30,303        
Exercise price                 $ 3.81        
Third stock issuance                          
Exercised number of shares                 19,626        
Exercise price                 $ 5.87        
Fourth stock issuance                          
Exercised number of shares                 55,860        
Exercise price                 $ 5.15        
Fifth Stock Issuance                          
Exercised number of shares                 22,400        
Exercise price                 $ 3.44        
Series G                          
Number of shares issued for the exchange offer       5,449                  
Series H                          
Number of shares issued for the exchange offer       18,982                  
Series G and Series H ADS exchange offer                          
Value of the exchange offer       $ 7,893                  
Tender offer, stocks       7,589,176                  
Shares exchanged aggregate book value       $ 61,078                  
Repurchase of preferred stock       $ 9,323                  
American Depositary Shares - The Series G                          
Sale of Stock-net proceeds $ 47,846                        
Preferred stock shares outstanding             14,551 20,000          
American Depositary Shares - The Series H                          
Sale of Stock-net proceeds     $ 115,756                    
Preferred stock shares outstanding             29,018 48,000          
Convertible preferred stock                          
Conversion of Stock, Shares converted             0 1,134          
Preferred stock shares outstanding             5,935 5,935          
Common Stock                          
Converted Shares of Common Stock               1,134,000 1,410,000        
Acquisition of treasury stock, shares             948,584 199,324          
Amount of tender offer paid in cash             $ 1            
Tender offer, stocks             7,589,176            
Preferred Stock                          
Conversion of Stock, Shares converted               (1,134) (1,410)        
Number of shares issued for the exchange offer             24,431            
Share Repurchase Program | Common Stock                          
Share repurchase program, Authorized amount             $ 25,000            
Acquisition of treasury stock, shares   1,147,908         948,584 199,324          
Acquisition of treasury stock, value   $ 1,070         $ 818 $ 252