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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2013 Vessel | Dec. 31, 2014 T
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments |  | 30 tdw_SignificantCommitmentNumberOfVessel
Vessel Commitments |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments |  | 28 tdw_SignificantCommitmentNumberOfVessel / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_VesselCommitmentsMember
Deepwater PSVs |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Significant commitment, new construction deadweight tons capacity range, low |  | 3,000 tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeLow / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember
Significant commitment, new construction deadweight tons capacity range, high |  | 6,360 tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeHigh / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember
Significant commitment, new construction final delivery date |  | August 2016
Number of vessels took for delivery | 2 tdw_SignificantDeliveryCommitmentNumberOfVessels / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Amount held as escrow | $ 11.7 us-gaap_EscrowDeposit / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Number of vessels | 2 tdw_NumberOfVessels / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Number of vessels, sold | 1 tdw_NumberOfVesselsSold / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Deferred gain amortization period | 10 years |
Towing Supply Vessels |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Significant commitment, new construction brake horsepower |  | 7,145 tdw_SignificantCommitmentNewConstructionBrakeHorsepower / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_TowingSupplyAndSupplyMember
Remotely Operated Vehicles Commitments |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels took for delivery |  | 2 tdw_SignificantDeliveryCommitmentNumberOfVessels / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_RemotelyOperatedVehiclesCommitmentsMember
Shallow Water Towing Supply Vessels |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Insurance coverage by the third party credit support for the carrying value of the accumulated costs |  | 2.5 tdw_CommitmentsAndContingenciesCarryingValueOfAccumulatedCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_ShallowWaterTowingSupplyVesselsMember
Fast, Crew/Supply Boat |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Insurance coverage by the third party credit support for the carrying value of the accumulated costs |  | 2.4 tdw_CommitmentsAndContingenciesCarryingValueOfAccumulatedCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember
Number of vessels under construction |  | 1 tdw_SignificantCommitmentsNewConstruction / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember
Insurance coverage for the progress payments made on the vessel by the third party credit support |  | 90.00%tdw_CommitmentsAndContingenciesPercentageOfThirdPartyCredit / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember
Committed and invested amount |  | 8.0 tdw_FundedInvestmentCommitments / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember

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- Definition Commitments And Contingencies Carrying Value Of Accumulated Costs + References No definition available. + Details
Name: | tdw_CommitmentsAndContingenciesCarryingValueOfAccumulatedCosts
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitments And Contingencies Percentage Of Third Party Credit + References No definition available. + Details
Name: | tdw_CommitmentsAndContingenciesPercentageOfThirdPartyCredit
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Related Gain Amortization Period + References No definition available. + Details
Name: | tdw_DeferredRelatedGainAmortizationPeriod
Namespace Prefix: | tdw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Funded Investment Commitments + References No definition available. + Details
Name: | tdw_FundedInvestmentCommitments
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of Vessels + References No definition available. + Details
Name: | tdw_NumberOfVessels
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Vessels Sold + References No definition available. + Details
Name: | tdw_NumberOfVesselsSold
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant commitment, new construction brake horsepower. + References No definition available. + Details
Name: | tdw_SignificantCommitmentNewConstructionBrakeHorsepower
Namespace Prefix: | tdw_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range High + References No definition available. + Details
Name: | tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeHigh
Namespace Prefix: | tdw_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range Low + References No definition available. + Details
Name: | tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeLow
Namespace Prefix: | tdw_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Significant Commitment Number Of Vessel + References No definition available. + Details
Name: | tdw_SignificantCommitmentNumberOfVessel
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Significant commitment projected delivery date range. + References No definition available. + Details
Name: | tdw_SignificantCommitmentProjectedDeliveryDateRange
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Significant Commitments, New Construction + References No definition available. + Details
Name: | tdw_SignificantCommitmentsNewConstruction
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Significant Delivery Commitment Number Of Vessels + References No definition available. + Details
Name: | tdw_SignificantDeliveryCommitmentNumberOfVessels
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_DeepwaterPlatformSupplyVesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_FastCrewSupplyBoatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_RemotelyOperatedVehiclesCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_ShallowWaterTowingSupplyVesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_TowingSupplyAndSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=tdw_VesselCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |