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Note 8 - Asset Held for Sale, Asset Sales and Asset Impairments - Summary of Impairment of Vessels (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impairment and other expense		$ 74,109	$ 37,773	$ 61,132
Vessels Held for Sale [Member]
Impairment and other expense		$ 75,177	$ 26,746	$ 0
Assets held for sale		47	35	0
Vessels, Active Fleet [Member]
Active vessels		0	0	56
Impairment and other expense		$ 0	$ 0	$ 61,132
Vessel, Obsolete Inventory [Member]
Impairment and other expense	$ 5,200	$ 2,959	$ 5,223	$ 0
Obsolete inventory		0	0	0
Vessel, Other [Member]
Other		0	0	0
Other, impairment		$ (4,027)	$ 5,804	$ 0

X

- Definition

The number of active fleet vessels impaired during period.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

The number of vessels classified as obsolete inventory impaired during period.

+ References

No definition available.

+ Details

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

X

- Definition

The number of vessels classified as other impaired during period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of other asset impairment charges (recovery).

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

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Period Type:	duration

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- Details

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X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type: