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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2011 BRL Vessel | Dec. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 BRL | Dec. 31, 2014 Revised USD ($) | Dec. 31, 2014 Revised BRL
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Fines assessed | 155.0 tdw_AssessedFine |  | $ 58.3 tdw_AssessedFine |  | $ 47.8 tdw_AssessedFine / tdw_OperationRevenuesByEntityAxis = tdw_RevisedMember | 127.0 tdw_AssessedFine / tdw_OperationRevenuesByEntityAxis = tdw_RevisedMember
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from | 17 tdw_NumberOfVesselsThatSubsidiariesFailedToObtainImportLicensesFrom |  |  |  |  |
Disallowed amount of total fines by the administrative appeals board |  | 56.1 tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard |  | 149.0 tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard |  |
Remaining amount of fines contested |  | 10.5 tdw_RemainingFineAmount |  | 28.0 tdw_RemainingFineAmount |  |
Decision disallowing the fines totaling |  |  |  | 127.0 tdw_DisallowedAmountOfTotalFinesByAdministrativeAppealsBoard |  |

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- Definition Amount Of Fines Disallowed By Administrative Appeals Board + References No definition available. + Details
Name: | tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | tdw_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Disallowed Amount of Total Fines by Administrative Appeals Board + References No definition available. + Details
Name: | tdw_DisallowedAmountOfTotalFinesByAdministrativeAppealsBoard
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number Of Vessels That The Subsidiaries Failed To Obtain Import Licenses From + References No definition available. + Details
Name: | tdw_NumberOfVesselsThatSubsidiariesFailedToObtainImportLicensesFrom
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
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