Transactions with Related Parties (Details)
€ in Thousands, $ in Thousands
 4 Months Ended 5 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2016
Jun. 07, 2017
Jun. 05, 2015
Nov. 30, 2018
USD ($)
Nov. 18, 2014
Dec. 13, 2013
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2012
USD ($)
Commissions paid             $ 28,393   $ 23,667 $ 21,799  
General and administrative expenses             27,513   27,521 25,295  
Other income             14,582   6,140 18,175  
Other long-term liabilities and deferred income             19,063   43,382    
Goldland Anonymos Eteria                      
Annual lease payments of office             1,109 € 939      
Acropolis                      
Commissions paid             0   0 0  
Trade accounts payable             76   76    
Navios Partners Agreement                      
Maximum payout of company under Navios Partner's guarantee                     $ 20,000
General and administrative expenses             9,344   8,347 7,751  
Other income             1,999        
Navios Partners Agreement | Guarantee claim                      
Other long-term liabilities and deferred income             18,001   20,000    
Navios Acquisition Agreement                      
General and administrative expenses             8,810   9,000 9,427  
Navios Logistics Agreement                      
General and administrative expenses             1,000   1,000 1,000  
Termination date of the administrative services agreement December 2021                    
Navios Europe I Agreement                      
General and administrative expenses             1,330   1,187 1,300  
Administrative services agreement term in years           6 years          
Navios Midstream Agreement                      
General and administrative expenses             1,494   1,500 1,500  
Administrative services agreement term in years         5 years            
Navios Europe II Agreement                      
General and administrative expenses             $ 2,041   1,766 $ 1,820  
Administrative services agreement term in years     6 years                
Navios Containers agreement                      
General and administrative expenses       $ 5,373         $ 1,868    
Administrative services agreement term in years   5 years                  
Navios Containers agreement with automatic extension                      
Administrative services agreement term in years             5 years 5 years