Investment in Affiliates and Available-for-Sale Securities - Navios Europe I and Navios Europe II (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Oct. 09, 2013
USD ($)
Dec. 31, 2014
USD ($)
Feb. 18, 2015
Dec. 18, 2013
USD ($)
Investments In And Advances To Affiliates [Line Items]                  
Long-term debt $ 1,584,023 $ 1,584,023 $ 1,624,712 $ 1,584,023 $ 1,624,712        
Investments in affiliates 371,405 371,405 340,375 371,405 340,375   $ 344,453    
Portion of the carrying balance of related party loan $ 11,464 11,464   11,464     7,791    
Equity in net earnings of affiliated companies   $ 17,968 7,079 31,880 29,497        
Proceeds from long-term loans       $ 0 40,385        
Navios Acquisition                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage 46.10% 46.10%   46.10%          
Navios Partners                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage 20.10% 20.10%   20.10%          
Navios Europe I                  
Investments In And Advances To Affiliates [Line Items]                  
Estimated maximum potential loss       $ 14,482     13,415    
Investments in affiliates $ 5,145 $ 5,145   5,145     4,936    
Equity in net earnings of affiliated companies   399 $ 311 560 $ 462        
Investments in affiliates 6,163 6,163   $ 6,163     5,602    
Profit Sharing Arrangement       On an ongoing basis, Navios Europe I is required to distribute cash flows (after payment of operating expenses and amounts due pursuant to the terms of the Senior Loans I) according to a defined waterfall calculation.          
Ownership percentage           47.50%      
Navios Europe I | Navios Acquisition                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage           47.50%      
Navios Europe I | Navios Partners                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage           5.00%      
Navios Europe I | Navios Revolving Loans                  
Investments In And Advances To Affiliates [Line Items]                  
Portion of the carrying balance of related party loan 8,319 8,319   $ 8,319     $ 7,813    
Navios Europe II                  
Investments In And Advances To Affiliates [Line Items]                  
Estimated maximum potential loss       7,624          
Investments in affiliates 4,275 4,275   4,275          
Equity in net earnings of affiliated companies   33   33          
Investments in affiliates 4,308 4,308   $ 4,308          
Profit Sharing Arrangement       On an ongoing basis, Navios Europe II is required to distribute cash flows (after payment of operating expenses, amounts due pursuant to the terms of the Senior LoansII) according to a defined waterfall calculation.          
Ownership percentage               47.50%  
Navios Europe II | Navios Acquisition                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage               47.50%  
Navios Europe II | Navios Partners                  
Investments In And Advances To Affiliates [Line Items]                  
Ownership percentage               5.00%  
Navios Europe II | Navios Revolving Loans                  
Investments In And Advances To Affiliates [Line Items]                  
Portion of the carrying balance of related party loan $ 3,316 $ 3,316   $ 3,316          
Navios Europe I                  
Investments In And Advances To Affiliates [Line Items]                  
Number of vessels acquired                 10
Navios Europe II                  
Investments In And Advances To Affiliates [Line Items]                  
Number of vessels acquired 9 9   9          
Proceeds from long-term loans       $ 87,000          
Navios Europe II | New Junior Loan II                  
Investments In And Advances To Affiliates [Line Items]                  
Debt Instrument Face Amount $ 182,450 $ 182,450   182,450          
Navios Europe II | Senior Loan $87,000                  
Investments In And Advances To Affiliates [Line Items]                  
Cash consideration 96,000                
Navios Holdings, Acquisition, Partners | Navios Europe I                  
Investments In And Advances To Affiliates [Line Items]                  
Long-term debt                 $ 10,000
Revolving loan facility to fund working capital requirements, outstanding           $ 24,100      
Navios Holdings, Acquisition, Partners | Navios Europe II                  
Investments In And Advances To Affiliates [Line Items]                  
Long-term debt $ 9,000 $ 9,000   9,000          
Revolving loan facility to fund working capital requirements, outstanding       $ 38,500