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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Apr. 30, 2011 BRL Vessel | Mar. 31, 2015 USD ($) | Mar. 31, 2015 BRL | Mar. 31, 2015 Revised USD ($) | Mar. 31, 2015 Revised BRL
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Fines assessed | 155.0 tdw_AssessedFine | $ 48.5 tdw_AssessedFine |  | $ 39.7 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 |  | 46.6 tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard | 149.0 tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard |  |
Remaining amount of fines contested |  | 8.8 tdw_RemainingFineAmount | 28.0 tdw_RemainingFineAmount |  |
Decision disallowing the fines totaling |  |  | 127 tdw_DisallowedAmountOfTotalFinesByAdministrativeAppealsBoard |  |

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- Definition Amount Of Fines Disallowed By Administrative Appeals Board + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Assessed Fine + References No definition available. + Details
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Balance Type: | credit
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- Details
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- Definition Disallowed Amount of Total Fines by Administrative Appeals Board + References No definition available. + Details
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- Definition Number Of Vessels That The Subsidiaries Failed To Obtain Import Licenses From + References No definition available. + Details
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- Definition Remaining Fine Amount + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration