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v2.4.1.9

Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 Vessel | Mar. 31, 2015 T | Mar. 31, 2013 Vessel
Significant Purchase and Supply Commitment [Line Items] |  |  |
Cash compensation on termination of employment, maximum |  | 43 us-gaap_DefinedBenefitPlanSpecialTerminationBenefits |
Number of Vessels, commitments |  | 21 tdw_SignificantCommitmentNumberOfVessel |
Towing Supply Vessels |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |
Significant commitment, new construction brake horsepower |  | 7,145 tdw_SignificantCommitmentNewConstructionBrakeHorsepower / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_TowingSupplyAndSupplyMember |
Deepwater PSVs |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |
Significant commitment, new construction deadweight tons capacity range, low |  | 3,800 tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeLow / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Significant commitment, new construction deadweight tons capacity range, high |  | 6,000 tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacityRangeHigh / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |
Significant commitment, new construction final delivery date |  | September 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
Fast, Crew/Supply Boat |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |
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 |
Insurance coverage by the third party credit support for the carrying value of the accumulated costs |  | 2.4 tdw_CommitmentsAndContingenciesCarryingValueOfAccumulatedCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember |
Committed and invested amount |  | 8 tdw_FundedInvestmentCommitments / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_FastCrewSupplyBoatMember |

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

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- Definition Commitments And Contingencies Percentage Of Third Party Credit + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Deferred Related Gain Amortization Period + References No definition available. + Details
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- Definition Funded Investment Commitments + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of Vessels + References No definition available. + Details
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- Definition Number of Vessels Sold + References No definition available. + Details
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- Definition Significant commitment, new construction brake horsepower. + References No definition available. + Details
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Balance Type: | na
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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range High + References No definition available. + Details
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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range Low + References No definition available. + Details
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Namespace Prefix: | tdw_
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- Definition Significant Commitment Number Of Vessel + References No definition available. + Details
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- Definition Significant commitment projected delivery date range. + References No definition available. + Details
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- Definition Significant Commitments, New Construction + References No definition available. + Details
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- Definition Significant Delivery Commitment Number Of Vessels + References No definition available. + Details
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- Details
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- Definition The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Termination Benefits -URI http://asc.fasb.org/extlink&oid=6526498 + Details
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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
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- Details
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- Details
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- Details
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Period Type: |