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Note 8 - Asset Held for Sale, Asset Sales and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Additions | 46 | 32 |  |  |
Sales |  |  | (53) |  |
Ending balance |  | 23 | 23 |  |
Vessels Held for Sale [Member] |  |  |  |  |
Beginning balance |  |  | 46 | 0 | 0
Beginning balance |  |  | $ 39,287 | $ 0 | $ 0
Additions |  |  | 32 | 46 | 0
Additions |  |  | $ 97,664 | $ 66,033 | $ 0
Sales |  |  | (53) | 0 | 0
Sales |  |  | $ (26,877) | $ 0 | $ 0
Reactivation |  |  | (2) | 0 | 0
Reactivation |  |  | $ (500) | $ 0 | $ 0
Impairment |  |  | $ (75,177) | $ (26,746) | $ 0
Ending balance | 46 | 23 | 23 | 46 | 0
Ending balance | $ 39,287 | $ 34,397 | $ 34,397 | $ 39,287 | $ 0

X
- Definition Additional impairment from assets held for sale. + References No definition available. + Details
Name: | tdw_AdditionalImpairmentFromAssetsHeldForSale
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- Definition The value of assets held for sale are reactivated during period. + References No definition available. + Details
Name: | tdw_AssetsHeldForSaleReactivation
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 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

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- 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 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
Name: | tdw_NumberOfVesselsHeldForSaleSold
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 -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tdw_VesselsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |