Investments in Affiliates and Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]            
Equity in net earnings of affiliated companies   $ 3,424 $ 17,968 $ 16,376 $ 31,880  
Investments in affiliates   $ 388,772 371,405 388,772 371,405 $ 381,746
Dividends received       $ 0 7,298  
Navios Partners            
Schedule Of Equity Method Investments [Line Items]            
Common Units issued in public offering 4,600,000          
Proceeds From Issuance Of Common Limited Partners Units $ 60,214          
Proceeds from private placement of units to Navios Holdings $ 14,967          
Navios Partners | Private placement | Common units            
Schedule Of Equity Method Investments [Line Items]            
Private placement of units to Navios Holdings 1,120,547          
Navios Partners | Private placement | General partner units            
Schedule Of Equity Method Investments [Line Items]            
Private placement of units to Navios Holdings 22,868          
Navios Partners            
Schedule Of Equity Method Investments [Line Items]            
General partner interest of Navios Holdings       2.00%    
General Partner units held by Navios Holdings   1,695,509   1,695,509    
Common units held by Navios Holdings   15,344,310   15,344,310    
Difference between carrying amount of investment and underlying equity in net assets of equity method investee   $ 31,323   $ 31,323   32,300
Equity in net earnings of affiliated companies   (2,421) 4,097 (1,467) 8,170  
Investments in affiliates   113,078   113,078   115,432
Dividends received   $ 0 8,124 $ 0 16,248  
Ownership percentage of Navios Holdings   20.10%   20.10%    
Market value of the investment   $ 21,981   $ 21,981    
Acropolis            
Schedule Of Equity Method Investments [Line Items]            
Investments in affiliates   209   209   175
Dividends received   $ 85 0 $ 85 0  
Ownership percentage of Navios Holdings   35.00%   35.00%    
Ownership Interest       50.00%    
Profit Sharing Arrangement       Navios Holdings has a 50% interest in Acropolis, a brokerage firm for freight and shipping charters. Although Navios Holdings owns 50% of Acropolis' stock, Navios Holdings agreed with the other shareholder that the earnings and amounts declared by way of dividends will be allocated 35% to the Company with the balance to the other shareholder.    
Navios Acquisition            
Schedule Of Equity Method Investments [Line Items]            
Difference between carrying amount of investment and underlying equity in net assets of equity method investee   $ (1,227)   $ (1,227)   1,480
Equity in net earnings of affiliated companies   5,474 13,426 17,038 22,961  
Investments in affiliates   263,026   263,026   $ 253,286
Dividends received   $ 3,649 $ 3,649 $ 7,298 $ 7,298  
Ownership percentage of Navios Holdings   46.30%   46.30%    
Percentage of voting stock of Navios Holdings in Navios Acquisition       43.30%    
Market value of the investment   $ 114,574   $ 114,574