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Note 14 - Asset Dispositions, Asset Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands	3 Months Ended			12 Months Ended		39 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)
Number of Vessels, Held for Sale	12	18				85
Sales	(5)					(67)
Transfers	(1)		0
Transfers	$ (1,500)		$ 0
Ending balance	12	18				85
Vessels Held for Sale [Member]
Number of Vessels, Held for Sale	12		20	18	23
Beginning balance	$ 14,421		$ 34,396	$ 34,396
Sales	(5)		(3)
Sales	$ (4,330)		$ (3,182)
Ending balance	12		20	18	23
Ending balance	$ 8,591	$ 14,421	$ 31,214	$ 14,421	$ 34,396	$ 8,591

X

- Definition

The amount of sales of assets held for sale during the period.

+ References

No definition available.

+ Details

Name:	tdw_AssetsHeldForSaleSales
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in assets held for sale from transfers.

+ References

No definition available.

+ Details

Name:	tdw_AssetsHeldForSaleTransfers
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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:	duration

X

- Definition

The number of vessels classified as held for sale are sold during period.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSaleSold
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of increase (decrease) in vessels held for sale from transfers.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSaleTransfers
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126982154&loc=d3e400-110220

+ Details

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tdw_VesselsHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: