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Note 5 - Investment in Unconsolidated Affiliates - Company Operations Due to Affiliates (Details) - Sonatide [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Due to Sonatide at beginning of year |  | $ 0 | $ 40,432 | $ 32,767
Plus commissions payable to Sonatide |  | 0 | 0 | 3,832
Plus amounts paid by Sonatide on behalf of the company |  | 0 | 0 | 10,914
Less amounts used to offset Due from Sonatide obligations (A) | [1] | 0 | 0 | (8,530)
Write off of due to affiliate in connection with the acquisition |  | 0 | (40,432) | 0
Other |  | 0 | 0 | 1,449
Accounts Payable |  | $ 0 | $ 0 | $ 40,432
[1] | We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

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- Definition The amounts paid by the affiliate on behalf of the company. + References No definition available. + Details
Name: | tdw_DueToAffiliateAmountsPaidByAffiliate
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of commissions to be paid to the affiliate. + References No definition available. + Details
Name: | tdw_DueToAffiliateCommisionsToBePaid
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of increase (decrease) in due to affiliate, classified as other. + References No definition available. + Details
Name: | tdw_DueToAffiliateOtherIncreaseDecrease
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount used to offset obligations of due from affiliate to due to affiliate amounts. + References No definition available. + Details
Name: | tdw_DueToRelatedPartyAmountUsedToOffsetObligations
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the write off due to affiliate in connection with the acquisition + References No definition available. + Details
Name: | tdw_WriteOffDueToAffiliates
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |