Investments in Affiliate Companies and Investments in Available-for-Sale Securities - Financial Information of the Affiliate Companies - Balance Sheet (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents, including restricted cash $ 137,851 $ 111,184 $ 78,727 $ 150,774
Current assets 229,447 194,857    
Non-current assets 1,579,331 1,776,468    
Current liabilities 497,448 592,782    
Non-current liabilities 1,244,686 1,412,826    
Navios Partners [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents, including restricted cash 169,446 30,728    
Current assets 226,340 60,780    
Non-current assets 3,396,959 1,146,489    
Current liabilities 395,505 253,252    
Long- term debt including current portion, net 1,361,709 486,857    
Non-current liabilities 1,458,069 299,187    
Navios Acquisition [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents, including restricted cash 0 41,357    
Current assets 0 140,605    
Non-current assets 0 1,428,392    
Current liabilities 0 805,860    
Long- term debt including current portion, net 0 1,076,587    
Non-current liabilities 0 433,280    
Navios Containers [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents, including restricted cash 0 7,573    
Current assets 0 16,684    
Non-current assets 0 414,106    
Current liabilities 0 39,862    
Long- term debt including current portion, net 0 232,159    
Non-current liabilities $ 0 $ 199,383