Loss Per Common Share (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net loss attributable to Navios Holdings common stockholders $ (192,961) $ (192,110) $ (268,718)
Undeclared dividend on preferred stock and on unvested restricted shares (5,144) (7,178) (10,241)
Tender Offer — Redemption of preferred stock Series G and H including $16,863 of undeclared preferred dividend cancelled 0 45,680 0
Gain from eliminated dividend on preferred stock due to conversion 166 0 0
Loss attributable to Navios Holdings common stockholders, basic and diluted $ (197,939) $ (153,608) $ (278,959)
Denominator:      
Denominator for basic and diluted net loss per share attributable to Navios Holdings common stockholders — adjusted weighted shares 12,896,568 12,356,024 11,958,959
Basic and diluted net loss per share attributable to Navios Holdings common stockholders $ (15.35) $ (12.43) $ (23.33)