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Note 8 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Number of Vessels Sold | 6 | 7 | 12
Number of Vessels, Held for Sale, Addition |  |  | 3
Number of Vessels, Transfer from Held for Sale to Active Fleet |  | 8 | 1
Number of Vessels, Held for Sale | 0 | 0 | 8
Proceeds from Sale of Vessels and Other Assets | $ 19,300 | $ 15,500 | $ 13,600
Impairment Charge Recaptured |  |  | 500
Asset Impairment Charges, Total | 0 | 0 | 714
Vessel, Obsolete Inventory [Member] |  |  |
Asset Impairment Charges, Total | $ 0 | $ 0 | $ 1,200

X
- Definition Amount of impairment charge recaptured during period. + References No definition available. + Details
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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
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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
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Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of vessels sold. + 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 transferred from held for sale to active fleet 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 Represents cash inflow form sale of vessels and other assets. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
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X
- Details
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Namespace Prefix: |
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