Transactions with Related Parties - Vessels Charter Hire and Management Fees (Details) - USD ($)
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 11 Months Ended
Jan. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 07, 2017
Jun. 05, 2015
Jun. 30, 2018
Jun. 30, 2017
Oct. 31, 2017
Nov. 30, 2016
Nov. 18, 2014
Dec. 13, 2013
Voyage expenses   $ 0 $ 0     $ 0 $ 651,000        
Navios Apollon | Extended charter hire agreement                      
Date of agreement           Apr. 30, 2015          
Lease term           one year          
Charter hire daily rate           $ 12,500          
Profit sharing, Percentage allocation based on earnings           50.00%          
Navios Libra | Extended charter hire agreement                      
Date of agreement           Apr. 30, 2015          
Lease term           one year          
Charter hire daily rate           $ 12,000          
Profit sharing, Percentage allocation based on earnings           50.00%          
Navios Felicity | Extended charter hire agreement                      
Date of agreement           Apr. 30, 2015          
Lease term           one year          
Charter hire daily rate           $ 12,000          
Profit sharing, Percentage allocation based on earnings           50.00%          
Navios Hope | Extended charter hire agreement                      
Date of agreement           Apr. 30, 2015          
Lease term           one year          
Charter hire daily rate           $ 10,000          
Profit sharing, Percentage allocation based on earnings           50.00%          
Navios Fantastiks | Charter hire agreement                      
Charter hire daily rate           $ 12,500          
Navios Gemini | Charter hire agreement                      
Charter hire daily rate           7,600          
Navios Pollux | Charter hire agreement                      
Charter hire daily rate           $ 11,400          
Navios Sun, Navios Orbiter, Navios Soleil, Navios Alegria, Navios Harmony and Navios Hyperion | Maximum                      
Lease term           12 months          
Navios Sun, Navios Orbiter, Navios Soleil, Navios Alegria, Navios Harmony and Navios Hyperion | Charter hire agreement                      
Charter hire daily rate           $ 12,000          
Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun | Minimum                      
Lease term           9 months          
Navios Partners for the Navios Gemini, Navios Hyperion, Navios Soleil, Navios Harmony, Navios Orbiter, Navios Fantastiks, Navios Alegria, Navios Pollux and Navios Sun | Charter hire agreement                      
Profit sharing, Percentage allocation based on earnings           50.00%          
Navios Fulvia | Charter hire agreement                      
Date of agreement           Nov. 30, 2016          
Charter hire daily rate           $ 11,500          
Duration of agreements                 3 months    
Navios Partners                      
Termination date of the administrative services agreement           December 31, 2022          
Management fees   17,382 14,322     $ 34,072 28,665        
Navios Partners | Ultra-Handymax vessel                      
Daily management fee $ 4,000         4,200   $ 4,100      
Navios Partners | Panamax vessel                      
Daily management fee 4,100         4,300   4,200      
Navios Partners | Capesize vessel                      
Daily management fee 5,100         5,250   5,250      
Navios Partners | Container vessel of 6,800 TEU                      
Daily management fee 6,500         6,700   6,700      
Navios Partners | Container vessel more than 8,000 TEU                      
Daily management fee 7,200         7,400   7,400      
Navios Partners | Container vessel more than 13,000 TEU                      
Daily management fee $ 8,500         $ 8,750   $ 8,750      
Navios Acquisition                      
Termination date of the administrative services agreement           May 2020          
Management fees   22,913,000 23,678,000     $ 46,312,000 47,096,000        
Navios Acquisition | Amendement of management agreement                      
Termination date of the administrative services agreement           May 31, 2018          
Navios Acquisition | MR2 product tanker and chemical tanker vessel | Extended management agreement                      
Daily management fee           $ 6,000          
Duration of agreements           2 years          
Navios Acquisition | MR2 product tanker and chemical tanker vessel | Amendement of management agreement                      
Daily management fee           $ 6,350          
Navios Acquisition | MR2 product tanker and chemical tanker vessel | Further amendement of management agreement                      
Daily management fee           6,500          
Navios Acquisition | LR1 product tanker vessel | Extended charter hire agreement                      
Daily management fee           $ 7,000          
Duration of agreements           2 years          
Navios Acquisition | LR1 product tanker vessel | Amendement of management agreement                      
Daily management fee           $ 7,150          
Navios Acquisition | LR1 product tanker vessel | Further amendement of management agreement                      
Daily management fee           7,150          
Navios Acquisition | VLCC vessel | Extended management agreement                      
Daily management fee           $ 9,500          
Duration of agreements           2 years          
Navios Acquisition | VLCC vessel | Amendement of management agreement                      
Daily management fee           $ 9,500          
Navios Acquisition | VLCC vessel | Further amendement of management agreement                      
Daily management fee           9,500          
Navios Europe I                      
Management fees   5,154,000 5,376,000     10,377,000 10,593,000        
Navios Europe I | Management agreement                      
Duration of agreements                     6 years
Navios Midstream                      
Management fees   5,187,000 5,187,000     $ 10,251,000 10,317,000        
Navios Midstream | Management agreement                      
Duration of agreements                   5 years  
Navios Midstream | VLCC vessel | Management agreement                      
Termination date of the administrative services agreement           Dec. 31, 2018          
Daily management fee           $ 9,500          
Navios Europe II                      
Management fees   5,540,000 5,473,000     10,801,000 11,186,000        
Navios Europe II | Management agreement                      
Duration of agreements         6 years            
Navios Containers | Management agreement                      
Management fees   $ 12,449,000 $ 915,000     $ 24,088,000 $ 915,000        
Duration of agreements       5 years              
Navios Containers | Automatic extension of management agreement                      
Duration of agreements           5 years          
Navios Containers | Container vessel more than 5,500 TEU                      
Daily management fee           $ 6,100          
Navios Containers | Container vessel more than 5,500 TEU and up to 8,000 TEU                      
Daily management fee           6,700          
Navios Containers | Container vessel more than 8,000 TEU and up to 10,000 TEU                      
Daily management fee           $ 7,400