Other Financial Information - Cash Flow Statement (Table) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities $ 1,739 $ 40,492  
Cash flows from investing activities      
Acquisition of investments in affiliates (20,471) (2,233)  
Loan to affiliate company (3,289) (2,831)  
(Increase)/decrease in long-term receivable from affiliate companies 9,488 (2,263)  
Dividends from affiliate companies 7,298 7,298  
Deposits for vessel acquisitions (6,625) (26,845)  
Acquisition of vessels 0 (71,862)  
Purchase of property, equipment and other fixed assets (4,577) (29,333)  
Net cash provided/(used in) in investing activities (18,176) (128,069)  
Cash flows from financing activities      
Net proceeds from issuance of preferred stock 0 47,847  
Proceeds from issuance of senior notes, net of debt issuance costs 0 365,732  
Repayment of long-term debt and payment of principal (31,022) (9,631)  
Repayment of senior notes 0 (290,000)  
Contribution from noncontrolling shareholders 0 3,484  
Dividends paid (20,644) (14,351)  
(Increase)/decrease in restricted cash 1,622 (469)  
Acquisition of noncontrolling interest 0 (10,889)  
Net cash (used in)/provided by financing activities (50,753) 132,181  
(Decrease)/ increase in cash and cash equivalents (67,190) 44,604  
Cash and cash equivalents, beginning of period 247,556 187,831 $ 187,831
Cash and cash equivalents, end of period 180,366 232,435 247,556
Navios Maritime Holdings Inc. Issuer      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities (20,906) (12,714)  
Cash flows from investing activities      
Acquisition of investments in affiliates (14,668)    
Dividends from affiliate companies 7,298 7,298  
Purchase of property, equipment and other fixed assets   (15)  
Net cash provided/(used in) in investing activities (7,370) 7,283  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries (17,602) (15,131)  
Issuance of common stock   638  
Net proceeds from issuance of preferred stock   47,847  
Dividends paid (20,644) (14,351)  
Net cash (used in)/provided by financing activities (38,246) 19,003  
(Decrease)/ increase in cash and cash equivalents (66,522) 13,572  
Cash and cash equivalents, beginning of period 98,539 33,769 33,769
Cash and cash equivalents, end of period 32,017 47,341 98,539
Guarantor Subsidiaries      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 12,887 59,782  
Cash flows from investing activities      
Acquisition of investments in affiliates (4,275)    
Loan to affiliate company (3,289) (2,831)  
(Increase)/decrease in long-term receivable from affiliate companies 9,488 (2,263)  
Deposits for vessel acquisitions (2,150) (17,288)  
Acquisition of vessels   (71,862)  
Purchase of property, equipment and other fixed assets (125) (135)  
Net cash provided/(used in) in investing activities (351) (94,379)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 16,074 12,898  
Proceeds from long-term loans, net of deferred finance fees   40,385  
Repayment of long-term debt and payment of principal (30,988) (9,597)  
Contribution from noncontrolling shareholders   3,484  
(Increase)/decrease in restricted cash 1,622 (469)  
Acquisition of noncontrolling interest   (10,889)  
Net cash (used in)/provided by financing activities (13,292) 35,812  
(Decrease)/ increase in cash and cash equivalents (756) 1,215  
Cash and cash equivalents, beginning of period 77,085 67,492 67,492
Cash and cash equivalents, end of period 76,329 68,707 77,085
Non Guarantor Subsidiaries      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 9,758 (6,576)  
Cash flows from investing activities      
Acquisition of investments in affiliates (1,528) (2,233)  
Deposits for vessel acquisitions (4,475) (9,557)  
Purchase of property, equipment and other fixed assets (4,452) (29,183)  
Net cash provided/(used in) in investing activities (10,455) (40,973)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 1,528 2,233  
Proceeds from issuance of senior notes, net of debt issuance costs   365,732  
Repayment of long-term debt and payment of principal (34) (34)  
Repayment of senior notes   (290,000)  
Payments of obligations under capital leases (709) (565)  
Net cash (used in)/provided by financing activities 785 77,366  
(Decrease)/ increase in cash and cash equivalents 88 29,817  
Cash and cash equivalents, beginning of period 71,932 86,570 86,570
Cash and cash equivalents, end of period 72,020 116,387 71,932
Total      
Condensed Financial Statements Captions [Line Items]      
Net cash (used in)/provided by operating activities 1,739 40,492  
Cash flows from investing activities      
Acquisition of investments in affiliates (20,471) (2,233)  
Loan to affiliate company (3,289) (2,831)  
(Increase)/decrease in long-term receivable from affiliate companies 9,488 (2,263)  
Dividends from affiliate companies 7,298 7,298  
Deposits for vessel acquisitions (6,625) (26,845)  
Acquisition of vessels   (71,862)  
Purchase of property, equipment and other fixed assets (4,577) (29,333)  
Net cash provided/(used in) in investing activities (18,176) (128,069)  
Cash flows from financing activities      
Transfer (to)/from other group subsidiaries 0 0  
Issuance of common stock   638  
Net proceeds from issuance of preferred stock   47,847  
Proceeds from long-term loans, net of deferred finance fees   40,385  
Proceeds from issuance of senior notes, net of debt issuance costs   365,732  
Repayment of long-term debt and payment of principal (31,022) (9,631)  
Repayment of senior notes   (290,000)  
Contribution from noncontrolling shareholders   3,484  
Dividends paid (20,644) (14,351)  
(Increase)/decrease in restricted cash 1,622 (469)  
Acquisition of noncontrolling interest   (10,889)  
Payments of obligations under capital leases (709) (565)  
Net cash (used in)/provided by financing activities (50,753) 132,181  
(Decrease)/ increase in cash and cash equivalents (67,190) 44,604  
Cash and cash equivalents, beginning of period 247,556 187,831 187,831
Cash and cash equivalents, end of period $ 180,366 $ 232,435 $ 247,556