Borrowings - Senior and Ship Mortgage Notes Navios Logistics and Navios Containers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jul. 08, 2020
Jun. 30, 2020
Jun. 30, 2019
Sep. 11, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Debt Instrument [Line Items]                      
Debt Instrument Carrying Amount $ 1,607,483     $ 1,607,483     $ 1,581,756        
Gain/ (Loss) on bond and debt extinguishment 0 $ 5,712   11,204 $ 21,374            
Restricted cash 1,058 9,732   1,058 9,732   736        
Line of credit 108,160     108,160     119,629        
Proceeds from long-term loans       66,862 127,171            
Secured credit facilities                      
Debt Instrument [Line Items]                      
Repayment of secured credit facility       $ 14,555              
2022 Senior Secured Notes                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Nov. 21, 2017              
Face amount at issuance date $ 305,000     $ 305,000              
Debt instrument, issuance price percentage       97.00%              
Fixed interest rate 11.25%     11.25%              
2022 Notes                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Nov. 29, 2013              
Face amount at issuance date $ 650,000     $ 650,000              
Fixed interest rate 7.375%     7.375%              
Repurchase of notes       $ 20,782     81,235 $ 35,661      
Cash consideration paid to repurchase debt       9,443     50,683 $ 28,796      
Gain/ (Loss) on bond and debt extinguishment   5,712   $ 11,204 21,374            
Debt Instrument Collateral       23 dry bulk vessels   17 dry bulk vessels          
Restricted cash $ 358 $ 7,410   $ 358 $ 7,410 $ 15,609     $ 15,251 $ 10,129 $ 14,000
2024 Notes                      
Debt Instrument [Line Items]                      
Redemption price percentage       100.00%              
NSM Loan                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Aug. 29, 2019              
Face amount at issuance date 141,795     $ 141,795              
Debt Instrument Carrying Amount 97,710     97,710     130,538        
Accrued Interest 835     835              
$50.0 million NSM Loan                      
Debt Instrument [Line Items]                      
Line of credit facility maximum borrowing capacity 50,000     $ 50,000              
Line of credit facility issuance date       Jun. 30, 2020              
Accrued Interest 14     $ 14              
Line of credit $ 31,514     31,514     0        
One Credit Facility                      
Debt Instrument [Line Items]                      
Repayment of secured credit facility       $ 5,556              
Upon occurrence of certain change of control events | 2022 Notes                      
Debt Instrument [Line Items]                      
Redemption price percentage       101.00%              
Series H Depositary Shares | 2024 Notes                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Mar. 21, 2019              
Fixed interest rate 9.75%     9.75%              
Senior Notes $ 4,747     $ 4,747              
Number of shares repurchased       10,930              
Series G Depositary Shares | 2024 Notes                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Apr. 21, 2019              
Fixed interest rate 9.75%     9.75%              
Senior Notes $ 3,879     $ 3,879              
Number of shares repurchased       8,841              
Navios Logistics | 2022 Notes                      
Debt Instrument [Line Items]                      
Repurchase of notes             35,500        
Cash consideration paid to repurchase debt             $ 17,642        
Navios Logistics | 2022 Logistics Senior Notes                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Apr. 22, 2014              
Face amount at issuance date $ 375,000     $ 375,000              
Fixed interest rate 7.25%     7.25%              
Maturity date       May 01, 2022              
Redemption Price       100.00%              
Redemption date       Jul. 16, 2020              
Navios Logistics | Navios Logistics New BBVA Loan Facility                      
Debt Instrument [Line Items]                      
Issuance date/Date of agreement       Feb. 14, 2020              
Face amount at issuance date $ 25,000     $ 25,000              
Amount used for repayment of debt     $ 11,375                
Debt Instrument, Basis Spread on Variable Rate       3.25%              
Interest Rate       LIBOR (180 days)              
Maturity date       Mar. 31, 2022              
Repayment frequency       quarterly              
Navios Logistics | Navios Logistics BBVA Loan Facility                      
Debt Instrument [Line Items]                      
Debt Instrument Carrying Amount 11,375     $ 11,375              
Navios Logistics | Navios Logistics other long-term loans and notes payable                      
Debt Instrument [Line Items]                      
Face amount at issuance date 138,946     $ 138,946              
Variable rate basis       LIBOR              
Navios Logistics | Navios Logistics other long-term loans and notes payable | Minimum                      
Debt Instrument [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate       3.15%              
Maturity date       Aug. 31, 2020              
Navios Logistics | Navios Logistics other long-term loans and notes payable | Maximum                      
Debt Instrument [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate       4.75%              
Maturity date       Nov. 30, 2024              
Navios Logistics | On or after January 15, 2019 | 2022 Logistics Senior Notes                      
Debt Instrument [Line Items]                      
Redemption price percentage       101.813%              
Navios Logistics | Upon occurrence of certain change of control events | 2022 Logistics Senior Notes                      
Debt Instrument [Line Items]                      
Redemption price percentage       101.00%              
Navios Logistics | Senior Notes 2025                      
Debt Instrument [Line Items]                      
Face amount at issuance date $ 500,000     $ 500,000              
Fixed interest rate 10.75%     10.75%