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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) R$ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2016 BRL (R$) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 BRL (R$) | Apr. 30, 2011 BRL (R$)
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Fines assessed |  | $ 10.0 |  | R$ 33
Fines assessed | R$ 3 | 0.9 |  |
Deposit Amount |  | 1.8 | R$ 6 |
Remaining amount of fines contested |  | $ 9.1 | R$ 30 |

X
- Definition Assessed fine. + References No definition available. + Details
Name: | tdw_AssessedFine
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assessed fine original. + References No definition available. + Details
Name: | tdw_AssessedFineOriginal
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deposit amount. + References No definition available. + Details
Name: | tdw_DepositAmount
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining fine amount. + References No definition available. + Details
Name: | tdw_RemainingFineAmount
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration