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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