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Note 14 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands | 3 Months Ended | 39 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2021 | Mar. 31, 2021 USD ($) | Mar. 31, 2022
Number of Vessels, Held for Sale | 12 | 18 |  | 85
Number of Vessels, Held for Sale, Sold | 5 |  |  | 67
Number of Vessels, Transfer from Held for Sale to Active Fleet |  |  |  | 6
Number of Vessels, Held for Sale, Addition | 0 |  |  |
Number of Vessels, Held for Sale, Reactivation | 1 |  |  |
Asset Held For Sale, Net Book Value | $ 8,600 |  |  |
Number of Active Vessels Sold | 0 |  | 3 |
Proceeds from Sale of Vessels | $ 4,600 |  | $ 11,000 |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | 200 |  | (1,900) |
Impairment Charge Recaptured | 500 |  |  |
Impairment of Long-Lived Assets to be Disposed of | $ 0 |  | $ 0 |

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

X
- Definition The number of active vessels sold. + References No definition available. + Details
Name: | tdw_NumberOfActiveVesselsSold
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
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: | duration

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 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
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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 The amount of cash inflow from the sale of vessels. + References No definition available. + Details
Name: | tdw_ProceedsFromSaleOfVessels
Namespace Prefix: | tdw_
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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + 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 https://asc.fasb.org/extlink&oid=126954810&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 15 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2611-110228 + Details
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