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Note 14 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022
Number Of Vessels Sold Or Scrapped |  | 6 | 9 |
Number of Vessels, Held for Sale |  | 2 | 9 | 8
Asset Held For Sale, Net Book Value |  | $ 0.6 | $ 6.9 |
Proceeds from Sale of Vessels |  | 8.7 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | $ 3.6 |  |
Number of Vessels, Held for Sale, Addition |  |  | 1 |
Number of Vessels, Transfer from Held for Sale to Active Fleet |  |  | 1 |
Impairment Charge Recaptured | $ 0.5 |  |  |
Vessels, Active Fleet [Member] |  |  |  |
Number Of Vessels Sold Or Scrapped |  | 2 |  |

X
- Definition Represents assets held for sale at net book value. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_
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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 Represents the number of vessels sold or scrapped. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
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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_
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Balance Type: | na
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- Definition The amount of cash inflow from the sale of vessels. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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X
- Details
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