Investments in affiliates and investments in available-for-sale securities (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance sheet        
Cash and cash equivalents, including restricted cash $ 111,184 $ 78,727 $ 150,774 $ 134,190
Current assets 194,857 168,001    
Non-current assets 1,776,468 1,974,854    
Current liabilities 592,782 225,273    
Non-current liabilities 1,412,826 1,758,557    
Income Statement        
Revenue 416,718 482,449 505,686  
Net (loss)/income (188,605) (184,452) (265,511)  
Navios Partners        
Balance sheet        
Cash and cash equivalents, including restricted cash 30,728 30,402    
Current assets 60,780 75,990    
Non-current assets 1,146,489 1,177,527    
Current liabilities 253,252 79,784    
Long- term debt including current portion, net 486,857 489,028    
Non-current liabilities 299,187 445,714    
Income Statement        
Revenue 226,771 219,379 231,361  
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II   (62,134) (13,081)  
Net (loss)/income (68,541) (62,134) (13,081)  
Navios Acquisition        
Balance sheet        
Cash and cash equivalents, including restricted cash 41,357 44,051    
Current assets 140,605 114,008    
Non-current assets 1,428,392 1,441,947    
Current liabilities 805,860 241,939    
Long- term debt including current portion, net 1,076,587 1,173,117    
Non-current liabilities 433,280 1,000,164    
Income Statement        
Revenue 361,438 280,117 187,946  
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II   (65,707) (82,233)  
Net (loss)/income 27,465 (65,707) (82,233)  
Navios Europe I        
Income Statement        
Revenue   36,822 34,885  
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II   (18,575) (22,881)  
Net (loss)/income   (18,575) (3,197)  
Navios Europe II        
Balance sheet        
Cash and cash equivalents, including restricted cash 0 27,431    
Current assets 0 32,249    
Non-current assets 0 179,688    
Current liabilities 0 57,078    
Long- term debt including current portion, net 0 89,025    
Non-current liabilities 0 163,123    
Income Statement        
Revenue 17,059 46,718 49,870  
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II   (30,203) (12,899)  
Net (loss)/income (26,661) (30,203) $ (12,169)  
Navios Containers        
Balance sheet        
Cash and cash equivalents, including restricted cash 7,573 18,109    
Current assets 16,684 29,450    
Non-current assets 414,106 430,852    
Current liabilities 39,862 71,397    
Long- term debt including current portion, net 232,159 245,658    
Non-current liabilities 199,383 198,925    
Income Statement        
Revenue 127,188 141,532    
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II   7,507    
Net (loss)/income $ 3,348 $ 7,507