Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Details)

v3.20.4
Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Other Income (Expense), net $ 3,094 $ (134) $ 54,964
Dry-Cargo Barge Pools Management | Affiliated Entity      
Related Party Transaction [Line Items]      
Related party transaction, amounts 600 500 900
Revenue from related parties 100 100 100
Payables to related parties 400 100  
SEACOR Marine Holdings Inc. | Transition Services | Affiliated Entity      
Related Party Transaction [Line Items]      
Revenue from related parties   $ 600 $ 4,600
SEACOR Marine Holdings Inc. | CARES Act net operating loss carryback fee | Affiliated Entity      
Related Party Transaction [Line Items]      
Other Income (Expense), net $ 1,000