Investments in Affiliates and Available-for-Sale Securities (Table) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Navios Partners          
Balance sheet          
Cash and cash equivalents, including restricted cash $ 86,048   $ 86,048   $ 25,088
Current assets 134,094   134,094   56,349
Non-current assets 1,193,458   1,193,458   1,212,231
Current liabilities 68,639   68,639   98,950
Long- term debt including current portion, net 475,017   475,017   523,776
Non-current liabilities 461,416   461,416   489,421
Income Statement          
Revenue 50,018 $ 44,877 92,429 $ 90,518  
Net (loss)/income 4,445 (16,807) (1,208) (16,598)  
Navios Acquisition          
Balance sheet          
Cash and cash equivalents, including restricted cash 56,792   56,792   56,658
Current assets 91,365   91,365   107,282
Non-current assets 1,530,030   1,530,030   1,596,337
Current liabilities 69,225   69,225   79,421
Long- term debt including current portion, net 1,084,699   1,084,699   1,095,938
Non-current liabilities 1,053,103   1,053,103   1,048,767
Income Statement          
Revenue 58,458 74,495 122,940 154,914  
Net (loss)/income (64,417) 12,184 (58,802) 35,954  
Acropolis          
Balance sheet          
Cash and cash equivalents, including restricted cash 489   489   720
Current assets 872   872   986
Non-current assets 73   73   84
Current liabilities 300   300   413
Long- term debt including current portion, net 0   0   0
Non-current liabilities 0   0   0
Income Statement          
Revenue 428 238 739 617  
Net (loss)/income 196 (5) 221 192  
Navios Europe I          
Balance sheet          
Cash and cash equivalents, including restricted cash 15,096   15,096   10,785
Current assets 20,101   20,101   15,980
Non-current assets 164,166   164,166   169,925
Current liabilities 20,153   20,153   18,490
Long- term debt including current portion, net 80,773   80,773   86,060
Non-current liabilities 156,406   156,406   155,387
Income Statement          
Revenue 9,394 10,418 19,278 20,530  
Net (loss)/income before non-cash change in fair value of Junior Loan I and Junior Loan II (1,950) (449) (3,239) (739)  
Net (loss)/income (2,491) (1,955) (432) (3,134)  
Navios Europe II          
Balance sheet          
Cash and cash equivalents, including restricted cash 15,235   15,235   16,916
Current assets 24,997   24,997   19,487
Non-current assets 224,929   224,929   232,363
Current liabilities 18,792   18,792   24,126
Long- term debt including current portion, net 111,572   111,572   119,234
Non-current liabilities 199,943   199,943   184,530
Income Statement          
Revenue 9,401 6,760 17,402 14,726  
Net (loss)/income before non-cash change in fair value of Junior Loan I and Junior Loan II (5,058) (6,889) (11,325) (11,913)  
Net (loss)/income (4,113) (3,220) (12,003) (7,122)  
Navios Containers          
Balance sheet          
Cash and cash equivalents, including restricted cash 34,936   34,936   0
Current assets 38,268   38,268   0
Non-current assets 59,065   59,065   0
Current liabilities 32,198   32,198   0
Long- term debt including current portion, net 33,670   33,670   0
Non-current liabilities 21,353   21,353   $ 0
Income Statement          
Revenue 3,102 0 3,102 0  
Net (loss)/income before non-cash change in fair value of Junior Loan I and Junior Loan II   0   0  
Net (loss)/income $ 881 $ 0 $ 881 $ 0