Transactions with Related Parties (Details)
€ in Thousands, $ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
shares
Mar. 20, 2017
shares
Mar. 16, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jun. 07, 2017
USD ($)
Jun. 05, 2015
May 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2017
EUR (€)
shares
Jun. 30, 2016
USD ($)
Nov. 18, 2014
Dec. 13, 2013
Dec. 31, 2016
USD ($)
Feb. 04, 2015
Dec. 31, 2012
USD ($)
General and administrative expenses $ 6,108       $ 6,392         $ 12,492   $ 12,830          
Due from affiliate, total 16,183                 16,183         $ 8,887    
Due from affiliate, current 375                 375         8,548    
Due from affiliate, non current 0                 0         11,105    
Due to affiliate, current 27,457                 27,457         32,847    
Due to affiliate non-current 68,491                 68,491         6,399    
Deferred gain recognized in Statement of Comprehensive Income (3,775)       3,424         1,307   16,376          
Credit facility outstanding amount 226,189                 226,189         248,313    
Outstanding balance 52,491                 52,491         49,876    
Loan receivable from affiliate companies 28,727                 28,727         23,008    
Other long term liabilities and deferred income 45,205                 45,205         43,388    
Goldland Anonymos Eteria                                  
Annual lease payments of office                   758 € 699            
Acropolis                                  
Commissions paid 0       0         0   0          
Trade accounts payable 76                 76         76    
Dividends received 0       85         0   85          
Navios Partners                                  
Due to affiliate, current 11,485                 11,485         8,664    
Due to affiliate non-current 7,718                 7,718         0    
Unamortized deferred gain for vessels and rights sold 10,900                 10,900         11,846    
Deferred gain recognized in Statement of Comprehensive Income 473       473         946   887          
Maximum borrowing capacity                 $ 60,000                
Amount drawn down           $ 21,000                      
Credit facility outstanding amount 0                 $ 0         0    
Interest rate description                 LIBOR plus 300 basis points                
Loan margin percentage                 3.00%                
Credit facility maturity date                 Jan. 02, 2017                
Partners capital account units acquisitions | shares | shares   66,131 975,408                            
Stock Issued During Period Shares New Issues | shares | shares     47,795,000                            
Navios Acquisition                                  
Termination date of the administrative services agreement                   May 2020 May 2020            
Due to affiliate, current 11,030                 $ 11,030         19,383    
Due to affiliate non-current 20,123                 20,123         6,399    
Navios Midstream                                  
Due to affiliate, current 1,664                 1,664         4,800    
Due to affiliate non-current 3,738                 $ 3,738         0    
Description of the option to acquire Navios Midstream                   Navios Holdings entered into an option agreement, with Navios Acquisition under which Navios Acquisition, which owns and controls Navios Maritime Midstream Partners GP LLC ("Midstream General Partner"), granted Navios Holdings the option to acquire a minimum of 25% of the outstanding membership interests in Midstream General Partner and the incentive distribution rights in Navios Midstream, representing the right to receive an increasing percentage of the quarterly distributions when certain conditions are met. The option shall expire on November 18, 2024. The purchase price for the acquisition for all or part of the option interest shall be an amount equal to its fair market value. As of June 30, 2017, Navios Holdings had not exercised any part of that option. Navios Holdings entered into an option agreement, with Navios Acquisition under which Navios Acquisition, which owns and controls Navios Maritime Midstream Partners GP LLC ("Midstream General Partner"), granted Navios Holdings the option to acquire a minimum of 25% of the outstanding membership interests in Midstream General Partner and the incentive distribution rights in Navios Midstream, representing the right to receive an increasing percentage of the quarterly distributions when certain conditions are met. The option shall expire on November 18, 2024. The purchase price for the acquisition for all or part of the option interest shall be an amount equal to its fair market value. As of June 30, 2017, Navios Holdings had not exercised any part of that option.            
Affiliates excluding Navios Europe I & Navios Europe II                                  
Due from affiliate, total 0                 $ 0         0    
Navios Containers                                  
Due to affiliate, current 1,555                 1,555         0    
Due to affiliate non-current 3,093                 3,093         0    
Deferred gain recognized in Statement of Comprehensive Income 88                                
Navios Partners Agreement                                  
Maximum payout of company under Navios Partner's guarantee                                 $ 20,000
Amount of future charter payments covered by guarantee 0                 0              
General and administrative expenses 1,919       1,938         3,865   3,876          
Navios Acquisition Agreement                                  
General and administrative expenses 2,250       2,375         4,500   4,768          
Navios Logistics Agreement                                  
General and administrative expenses 250       250         500   500          
Navios Europe I Agreement                                  
General and administrative expenses 295       323         588   646          
Administrative services agreement term in years                           6 years      
Navios Midstream Agreement                                  
General and administrative expenses 375       375         $ 750   750          
Administrative services agreement term in years                         5 years        
Share purchase agreement with Navios Partners                                  
Partners capital account units acquisitions | shares | shares                   1,313,399 1,313,399            
Navios Europe II Agreement                                  
General and administrative expenses 441       453         $ 876   906          
Administrative services agreement term in years               6 years                  
Navios Containers agreement                                  
General and administrative expenses             $ 79                    
Administrative services agreement term in years             5 years                    
Navios Containers agreement with automatic extension                                  
Administrative services agreement term in years                   1 year 1 year            
Navios Revolving Loans I Transfer                                  
Due to affiliate non-current 33,819                 $ 33,819              
Long-term liability recognized       $ 33,473                          
Debt instrument unamortized premium 11,457     12,089           $ 11,457              
Proceeds from transfer of debt       4,050                          
Consideration received       33,473                          
Navios Revolving Loans I Transfer | Navios Partners                                  
Loan receivable from affiliate companies       $ 21,384                          
Partners capital account units acquisitions | shares | shares       266,876                          
Consideration equity component       $ 29,423                          
Stock Issued During Period Shares New Issues | shares | shares       13,076,923                          
Minimum | Navios Midstream                                  
Option agreement percentage interests                   25.00% 25.00%            
Minimum | Share purchase agreement with Navios Partners                                  
Ownership percentage of Navios Holdings                               20.00%  
Navios Partners                                  
Deferred gain recognized in Statement of Comprehensive Income $ 2,432       (2,421)         $ 3,339   (1,467)          
Ownership percentage of Navios Holdings 20.90%                 20.90%              
Dividends received $ 0       $ 0         $ 0   $ 0          
Navios Europe I                                  
Due from affiliate, total 3,058                 3,058         2,376    
Due from affiliate, current 375                 375         145    
Due from affiliate, non current $ 2,683                 $ 2,683         2,231    
Ownership percentage of Navios Holdings 47.50%                 47.50%              
Navios Europe I | Navios Revolving Loans I                                  
Preferred Distribution Percentage                   12.70% 12.70%            
Loan receivable from affiliate companies $ 11,125                 $ 11,125         7,125    
Navios Europe I | Navios Revolving Loans I | Navios Holdings, Navios Acquisitions,Navios Partners                                  
Available amount of loan facility 4,800                 4,800              
Navios Europe II                                  
Due from affiliate, total 1,134                 1,134         10,453    
Due from affiliate, current 1,722                 1,722         8,402    
Due from affiliate, non current $ 2,856                 $ 2,856         2,051    
Ownership percentage of Navios Holdings 47.50%                 47.50%              
Navios Europe II | Navios Revolving Loans II                                  
Preferred Distribution Percentage                   18.00% 18.00%            
Loan receivable from affiliate companies $ 12,063                 $ 12,063         11,602    
Increase in maximum borrowing capacity   $ 14,000                              
Navios Europe II | Navios Revolving Loans II | Navios Holdings, Navios Acquisitions,Navios Partners                                  
Available amount of loan facility 15,005                 15,005              
Funding Commitment | Navios Europe I | Navios Revolving Loans I                                  
Available amount of loan facility 4,800                 4,800              
Funding Commitment | Navios Europe II | Navios Revolving Loans II                                  
Available amount of loan facility 15,005                 15,005              
Guarantee claim | Navios Partners Agreement                                  
Other long term liabilities and deferred income 19,739                 $ 19,739              
Navios Acquisition Loan                                  
Line of credit facility issuance date                   Sep. 19, 2016 Sep. 19, 2016            
Maximum borrowing capacity 70,000                 $ 70,000              
Line Credit Facility Arrangement Fees                   700              
Credit facility outstanding amount $ 53,494                 $ 53,494         51,240    
Fixed interest rate 8.75%                 8.75%              
Credit facility maturity date                   Nov. 15, 2018 Nov. 15, 2018            
Outstanding balance $ 52,491                 $ 52,491         49,876    
Proceeds from loan payable to affiliate company                             50,000    
Unamortized balance of deferred fees 1,003                 1,003         1,364    
Accrued interest on loan payable to affiliate company $ 3,494                 $ 3,494         $ 1,240    
Navios Acquisition Loan | Navios Logistics                                  
Ownership percentage of Navios Holdings 78.50%                 78.50%