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Note 14 - Asset Dispositions, Assets Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($)
Beginning balance |  |  | 8 |
Additions |  |  |  | 1
Ending balance | 2 | 9 | 2 | 9
Vessels Held for Sale [Member] |  |  |  |
Beginning balance | 3 | 12 | 8 | 18
Beginning balance | $ 695 | $ 8,591 | $ 4,195 | $ 14,421
Additions | 0 | 1 | 0 | 1
Additions | $ 0 | $ 2,500 | $ 0 | $ 2,500
Sales | (1) | (4) | (6) | (9)
Sales | $ (65) | $ (4,229) | $ (3,565) | $ (8,559)
Ending balance | 2 | 9 | 2 | 9
Ending balance | $ 630 | $ 6,862 | $ 630 | $ 6,862
Transfers |  |  | 0 | (1)
Transfers |  |  | $ 0 | $ (1,500)

X
- 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

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: | 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 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 -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: |