Vessels, Port Terminals and Other Fixed Assets - Impairment Loss/ Loss on Sale of Vessels, Net 2020 (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2021
Sep. 30, 2020
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Property Plant And Equipment [Line Items]                        
Impairment loss and gain/(loss) on sale of vessels         $ (88,367) $ (156,106) $ (200,657)          
Net liabilities included in sale price         4,378 0 $ 0          
Two dry bulk vessels held and used                        
Property Plant And Equipment [Line Items]                        
Impairment loss         $ 52,820 $ 84,584            
Navios Astra                        
Property Plant And Equipment [Line Items]                        
Disposal date         Feb. 28, 2021              
Year Built         2006              
Vessel capacity in DWT         53,468 dwt              
Vessel sale price               $ 6,644        
Impairment loss and gain/(loss) on sale of vessels         $ (6,288)              
Capitalized Cost, Impairment Loss         $ 98              
Navios Gem                        
Property Plant And Equipment [Line Items]                        
Year Built         2014              
Vessel capacity in DWT         181,336 dwt              
Navios Victory                        
Property Plant And Equipment [Line Items]                        
Year Built         2014              
Vessel capacity in DWT         77,095 dwt              
Vessel acquisition cost     $ 14,735                  
Cash consideration for purchase of vessel     $ 14,735                  
Navios Victory and Navios Gem                        
Property Plant And Equipment [Line Items]                        
Disposal date         Sep. 30, 2020              
Vessel sale price                 $ 51,000      
Impairment loss and gain/(loss) on sale of vessels         $ (7,683)              
Capitalized Cost, Impairment Loss         1,747              
Net liabilities included in sale price         $ 4,378              
Navios Amitie                        
Property Plant And Equipment [Line Items]                        
Disposal date         Sep. 30, 2020              
Year Built         2005              
Vessel capacity in DWT         75,395 dwt              
Vessel sale price                 $ 6,885      
Impairment loss and gain/(loss) on sale of vessels         $ (4,478)              
Navios Northern Star                        
Property Plant And Equipment [Line Items]                        
Disposal date         Aug. 31, 2020              
Year Built         2005              
Vessel capacity in DWT         75,395 dwt              
Vessel sale price                   $ 6,860    
Impairment loss and gain/(loss) on sale of vessels         $ (4,489)              
Navios Star                        
Property Plant And Equipment [Line Items]                        
Disposal date         May 31, 2020              
Year Built         2002              
Vessel capacity in DWT         76,662 dwt              
Vessel sale price                     $ 6,450  
Impairment loss and gain/(loss) on sale of vessels         $ (5,697)              
Capitalized Cost, Impairment Loss         $ 258              
Navios Kypros                        
Property Plant And Equipment [Line Items]                        
Disposal date         Feb. 29, 2020              
Year Built         2003              
Vessel capacity in DWT         55,222 dwt              
Vessel sale price                       $ 9,131
Impairment loss and gain/(loss) on sale of vessels         $ (5,551)              
Capitalized Cost, Impairment Loss         $ 404              
Jupiter N                        
Property Plant And Equipment [Line Items]                        
Year Built         2011              
Vessel capacity in DWT         93,062 dwt              
Rainbow N                        
Property Plant And Equipment [Line Items]                        
Year Built         2011              
Vessel capacity in DWT         79,642 dwt              
Jupiter N and Rainbow N                        
Property Plant And Equipment [Line Items]                        
Disposal date         Jun. 30, 2020              
Vessel acquisition cost       $ 24,883                
Navios Corali                        
Property Plant And Equipment [Line Items]                        
Disposal date         Mar. 31, 2020              
Year Built         2015              
Vessel capacity in DWT         181,249 dwt              
Vessel acquisition cost   $ 36,684                    
Cash consideration for purchase of vessel   $ 36,684                    
Navios Canary                        
Property Plant And Equipment [Line Items]                        
Disposal date         Jan. 31, 2020              
Year Built         2015              
Vessel capacity in DWT         180,528 dwt              
Vessel acquisition cost $ 35,111                      
Cash consideration for purchase of vessel $ 35,111