Other Financial Information - Cash Flow Statement (Table) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities $ 49,103 $ 40,137  
Cash flows from investing activities      
Acquisition of investments in affiliates (7,626) 0  
Loans to affiliate companies (4,461) (4,275)  
Acquisition of vessels 0 (60,115)  
Proceeds from sale of asset 5,280 0  
Deposits for vessel acquisitions (25,972) (44,628)  
Lease investments 100 0  
Purchase of property, equipment and other fixed assets (3,199) (3,301)  
Net cash used in investing activities (35,878) (112,319)  
Cash flows from financing activities      
Proceeds from transfer of rights to affiliate company 4,050 0  
Tender offer - Redmption of preferred stock - costs (482) 0  
Repayment of long-term debt and payment of principal (37,921) (18,115)  
Dividends paid 0 (3,681)  
Decrease in restricted cash (1,976) 11,000  
Acquisition of treasury stock 0 (819)  
Net cash (used in)/provided by financing activities (19,009) 49,299  
Decrease in cash and cash equivalents (5,784) (22,883)  
Cash and cash equivalents, beginning of period 135,992 163,412 $ 163,412
Cash and cash equivalents, end of period 130,208 140,529 135,992
Navios Maritime Holdings Inc. Issuer      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities (21,533) (28,889)  
Cash flows from investing activities      
Acquisition of investments in affiliates (5,000)    
Net cash used in investing activities (5,000)    
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 18,073 13,426  
Tender offer - Redmption of preferred stock - costs (482)    
Dividends paid   (3,681)  
Acquisition of treasury stock   (819)  
Net cash (used in)/provided by financing activities 17,591 8,926  
Decrease in cash and cash equivalents (8,942) (19,963)  
Cash and cash equivalents, beginning of period 15,875 34,152 34,152
Cash and cash equivalents, end of period 6,933 14,189 15,875
Guarantor Subsidiaries      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 43,962 52,146  
Cash flows from investing activities      
Acquisition of investments in affiliates   (60,115)  
Loans to affiliate companies (4,461) (4,275)  
Decrease in long-term receivable from affiliate companies   0  
Proceeds from sale of asset 5,280    
Purchase of property, equipment and other fixed assets (100) (97)  
Net cash used in investing activities 719 (64,487)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries (20,699) (13,426)  
Proceeds from transfer of rights to affiliate company 4,050    
Repayment of long-term debt and payment of principal (35,709) (18,081)  
Proceeds from long-term loans, net of deferred finance fees 15,093 39,128  
Decrease in restricted cash (1,976) 11,000  
Net cash (used in)/provided by financing activities (39,241) 18,621  
Decrease in cash and cash equivalents 5,440 6,280  
Cash and cash equivalents, beginning of period 54,935 47,753 47,753
Cash and cash equivalents, end of period 60,375 54,033 54,935
Non Guarantor Subsidiaries      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 26,674 16,880  
Cash flows from investing activities      
Acquisition of investments in affiliates (2,626)    
Deposits for vessel acquisitions (25,972) (44,628)  
Lease investments 100    
Purchase of property, equipment and other fixed assets (3,099) (3,204)  
Net cash used in investing activities (31,597) (47,832)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 2,626    
Repayment of long-term debt and payment of principal (2,212) (34)  
Proceeds from long-term loans, net of deferred finance fees 14,601 23,880  
Payments of obligations under capital leases (12,374) (2,094)  
Net cash (used in)/provided by financing activities 2,641 21,752  
Decrease in cash and cash equivalents (2,282) (9,200)  
Cash and cash equivalents, beginning of period 65,182 81,507 81,507
Cash and cash equivalents, end of period 62,900 72,307 65,182
Total      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 49,103 40,137  
Cash flows from investing activities      
Acquisition of investments in affiliates (7,626) (60,115)  
Loans to affiliate companies (4,461) (4,275)  
Decrease in long-term receivable from affiliate companies   0  
Dividends from affiliate companies 0    
Acquisition of vessels 0    
Proceeds from sale of asset 5,280    
Deposits for vessel acquisitions (25,972) (44,628)  
Lease investments 100    
Purchase of property, equipment and other fixed assets (3,199) (3,301)  
Net cash used in investing activities (35,878) (112,319)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 0 0  
Proceeds from transfer of rights to affiliate company 4,050    
Tender offer - Redmption of preferred stock - costs (482)    
Repayment of long-term debt and payment of principal (37,921) (18,115)  
Proceeds from long-term loans, net of deferred finance fees 29,694 63,008  
Dividends paid   (3,681)  
Decrease in restricted cash (1,976) 11,000  
Acquisition of treasury stock   (819)  
Payments of obligations under capital leases (12,374) (2,094)  
Net cash (used in)/provided by financing activities (19,009) 49,299  
Decrease in cash and cash equivalents (5,784) (22,883)  
Cash and cash equivalents, beginning of period 135,992 163,412 163,412
Cash and cash equivalents, end of period $ 130,208 $ 140,529 $ 135,992