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v3.21.2

Note 15 - Asset Dispositions, Asset Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Beginning balance |  |  | 23 | 46 | 46
Additions |  |  |  | 22 | 32
Sales |  |  | (8) |  | (53)
Transfers | (1) | 0 | (1) |  |
Transfers | $ (3,000) | $ 0 | $ (3,000) | $ 0 |
Ending balance | 14 |  | 14 |  | 23
Ending balance |  | $ 49,900 |  | $ 49,900 |
Vessels Held for Sale [Member] |  |  |  |  |
Beginning balance | 20 | 38 | 23 | 46 | 46
Beginning balance | $ 31,214 | $ 26,142 | $ 34,396 | $ 39,287 | $ 39,287
Additions | 0 | 22 | 0 | 22 |
Additions | $ 0 | $ 65,811 | $ 0 | $ 65,811 |
Sales | (5) | (14) | (8) | (22) |
Sales | $ (11,000) | $ (7,407) | $ (14,182) | $ (10,345) |
Impairment |  | $ (55,482) | $ 0 | $ (65,689) |
Ending balance | 14 | 46 | 14 | 46 | 23
Ending balance | $ 17,214 | $ 29,064 | $ 17,214 | $ 29,064 | $ 34,396

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- 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

X
- 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 amount of increase (decrease) in assets held for sale from transfers. + References No definition available. + Details
Name: | tdw_AssetsHeldForSaleTransfers
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

X
- 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 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 The number of increase (decrease) in vessels held for sale from transfers. + References No definition available. + Details
Name: | tdw_NumberOfVesselsHeldForSaleTransfers
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=123398962&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: |