Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | |||
| Impairment loss | $ 50,565 | $ 0 | $ 0 |
| Loss on investments in Navios Partners and Navios Aqcuisition | $ 228,026 | ||
| One vessel | |||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | |||
| Impairment loss | $ 32,930 | ||