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Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments - Summary of Impairment of Vessels (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Impairment and other expense |  | $ 15,643 | $ 74,109 | $ 37,773
Reactivation of asset held for sale |  | 1 | 0 | 0
Vessel, Obsolete Inventory [Member] |  |  |  |
Impairment and other expense | $ 5,200 | $ 1,905 | $ 2,959 | $ 5,223
Obsolete inventory |  | 0 | 0 | 0
Vessel, Other [Member] |  |  |  |
Other |  | 0 | 0 | 0
Other, impairment |  | $ 0 | $ (4,027) | $ 5,804
Vessels Held for Sale [Member] |  |  |  |
Assets held for sale |  | 8 | 47 | 35
Impairment and other expense |  | $ 15,388 | $ 75,177 | $ 26,746
Reactivation of asset held for sale |  | 3 | 2 | (0)
Reactivation of asset held for sale |  | $ 1,650 | $ (0) | $ (0)

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- Definition Represents asset impairment reactivation. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition The number of vessels classified as other impaired during period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of other asset impairment charges (recovery). + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&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 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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- Details
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- Details
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Period Type: |

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- Details
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