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Note 12 - Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities (Details Textual) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Vessels | 139 | 149 |
Number of Vessels, Held for Sale | 14 | 23 | 46

X
- Definition The number of vessels. + References No definition available. + Details
Name: | tdw_NumberOfVessels
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of vessels classified as held for sale. + References No definition available. + Details
Name: | tdw_NumberOfVesselsHeldForSale
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant