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Note 8 - Assets Held for Sale, Asset Sales and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Beginning balance | 0 | 8 |
Additions |  |  | 3
Ending balance | 0 | 0 | 8
Vessels Held for Sale [Member] |  |  |
Beginning balance | 0 | 8 | 18
Beginning balance | $ 0 | $ 4,195 | $ 14,421
Additions | 0 | 0 | 3
Additions | $ 0 | $ 0 | $ 2,561
Sales | 0 | (8) | (12)
Sales | $ 0 | $ (4,195) | $ (11,287)
Reactivation | 0 | 0 | (1)
Reactivation | $ 0 | $ 0 | $ (1,500)
Ending balance | 0 | 0 | 8
Ending balance | $ 0 | $ 0 | $ 4,195

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- Definition The amount of additions to assets held for sale during the period. + References No definition available. + Details
Name: | tdw_AssetsHeldForSaleAdditions
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The value of assets held for sale are reactivated during period. + References No definition available. + Details
Name: | tdw_AssetsHeldForSaleReactivation
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 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

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

X
- Definition The number of vessels classified as held for sale reactivated during period. + References No definition available. + Details
Name: | tdw_NumberOfVesselsHeldForSaleReactivation
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 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 -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 15 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482309/360-10-15-4 + 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: |